When Sofia Coppola's "The Bling Ring" hits movie theaters nationwide this weekend, all eyes will be on Emma Watson, who plays Nicki, one of a group of Los Angeles teens accused of breaking into celebrity houses and stealing upwards of $3 million worth of property.

Watson's character is based on now 21-year-old new mom Alexis Neiers, whose legal trials and tribulations were documented on the 2010 E! reality series "Pretty Wild," which also starred her younger sister Gabby Neiers, her mother Andrea Arlington and their adoptive family member and fellow model Tess Taylor (who inspired the "Bling Ring" character Sam, played by Taissa Farmiga).

The series (and one phone call to "Vanity Fair" journalist Nancy Jo Sales, in particular) became the butt of many jokes when it appeared Alexis wasn't taking her situation seriously. But behind the scenes, Alexis was dealing with a very serious addiction to heroin.

In an exclusive clip (above) of her interview with "Dateline," which airs Friday, June 21 at 8 p.m. ET on NBC, Alexis opens up about her drug problem and why she really wanted to be connected to Hollywood.

"I was smoking cigarettes already by, like, sixth grade and was already drinking. And it progressed from there. By the time that I was in ninth grade, I was doing acid all the time and cocaine and smoking weed. By the time I was 19, I was a full-blown heroin addict," she admitted, noting that she manipulated and lied to her mother to keep her addiction a secret.

In May, Alexis told Vice that she was high the entire time she was on "Pretty Wild." "People think I was living with my family, but I was living at a Best Western on Franklin and Vine. I was smoking 20 80-mg oxys a day, I was doing tons of cocaine, I was panhandling for drugs," she told the magazine. "I had an over-$10,000-a-week drug habit. What you were seeing on TV was not what was really going on."

Alexis explained to "Dateline" that she "got into the industry doing, like, odd jobs --- modeling, music videos, things like that -- because it sustained [her] drug habit."

Today, Alexis is sober and married to Evan Haines, who she met in AA. The two recently welcomed their first child Harper. "I just really wanna focus today on where I've been going for the last, you know, two and a half years, which is taking this path of sobriety and trying to do my best to help people get sober," she told "Dateline. "I'm really, really passionate about it."

For more from Alexis Neiers, tune into "Dateline" on Friday, June 21 at 8 p.m. ET on NBC.

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  • Emma Watson

    Emma Watson attends a screening of "The Bling Ring" on Tuesday, June 11, 2013 in New York. (Photo by Charles Sykes/Invision/AP)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actor Israel Broussard attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Claire Julien attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Taissa Farmiga attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actor Israel Broussard (L) and director Sofia Coppola attend 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Katie Chang attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Katie Chang attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Emma Watson attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Director Sofia Coppola attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Claire Julien attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Emma Watson attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Director Sofia Coppola attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Emma Watson attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • "The Bling Ring" New York Screening

    NEW YORK, NY - JUNE 11: Actress Emma Watson attends 'The Bling Ring' screening at Paris Theatre on June 11, 2013 in New York City. (Photo by Mike Coppola/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actor Israel Broussard arrives to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actors Taissa Farmiga, Katie Chang, Claire Julien, Emma Watson and Israel Broussard arrive to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Director Sofia Coppola, director Francis Ford Coppola and Eleanor Coppola arrive to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actors Taissa Farmiga, Katie Chang, Claire Julien, Emma Watson and Israel Broussard arrive to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Emma Watson arrives to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actors Taissa Farmiga, Katie Chang, Claire Julien, director Sofia Coppola, actors Emma Watson and Israel Broussard arrive to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Actors Taissa Farmiga, Katie Chang, Claire Julien, Emma Watson and Israel Broussard attend the premiere of A24's 'The Bling Ring' at the Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Actress Claire Julien and actor Israel Broussard attend the premiere of A24's 'The Bling Ring' at the Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actors Gavin Rossdale, Taissa Farmiga, Katie Chang, Claire Julien, director Sofia Coppola, actors Emma Watson and Israel Broussard arrive to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actors Emma Watson and Israel Broussard arrive to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Actress Katie Chang attends the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Paris Hilton and River Viiperi attend the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Paris Hilton and River Viiperi attend the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Paris Hilton and model River Viiperi arrive to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Claire Julien arrives to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Claire Julien arrives to the Los Angeles premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Actress Taissa Farmiga attends the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Katie Chang arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Actress Taissa Farmiga attends the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Director Sofia Coppola attends the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Katie Chang and director Sofia Coppola arrive to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Paris Hilton arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Paris Hilton arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Emma Watson arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Emma Watson arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Emma Watson arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Emma Watson arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Emma Watson arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Red Carpet

    LOS ANGELES, CA - JUNE 04: Actress Emma Watson arrives to the Los Angeles premiere of A24's 'The Bling Ring' at the Directors Guild Theater on June 4, 2013 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Actress Claire Julien attends the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Paris Hilton attends the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • Premiere of A24's "The Bling Ring" - Arrivals

    LOS ANGELES, CA - JUNE 04: Paris Hilton attends the premiere of A24's 'The Bling Ring' at Directors Guild Of America on June 4, 2013 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

  • FRANCE-FILM-FESTIVAL-CANNES

    British actress Emma Watson blows kisses as she arrives on May 16, 2013 for the screening of the film 'The Bling Ring' presented in the Un Certain Regard section at the 66th edition of the Cannes Film Festival in Cannes. Cannes, one of the world's top film festivals, opened on May 15 and will climax on May 26 with awards selected by a jury headed this year by Hollywood legend Steven Spielberg. AFP PHOTO / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

  • 'The Bling Ring' Premiere - The 66th Annual Cannes Film Festival

    CANNES, FRANCE - MAY 16: (L-R) Actresses Claire Julien, Taissa Fariga and Katie Chang, actor Israel Broussard, actress Emma Watson and director Sophia Coppola attend 'The Bling Ring' premiere during The 66th Annual Cannes Film Festival at the Palais des Festivals on May 16, 2013 in Cannes, France. (Photo by Gareth Cattermole/Getty Images)

  • 'The Bling Ring' Premiere - The 66th Annual Cannes Film Festival

    CANNES, FRANCE - MAY 16: (L-R) Director Sophia Coppola, actor Israel Broussard and actresses Emma Watson, Katie Chang, Taissa Fariga and Claire Julien attend 'The Bling Ring' premiere during The 66th Annual Cannes Film Festival at the Palais des Festivals on May 16, 2013 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images)

  • FRANCE-FILM-FESTIVAL-CANNES

    British actress Emma Watson blows kisses as she arrives on May 16, 2013 for the screening of the film 'The Bling Ring' presented in the Un Certain Regard section at the 66th edition of the Cannes Film Festival in Cannes. Cannes, one of the world's top film festivals, opened on May 15 and will climax on May 26 with awards selected by a jury headed this year by Hollywood legend Steven Spielberg. AFP PHOTO / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

  • FRANCE-FILM-FESTIVAL-CANNES-BLACK-WHITE

    BLACK AND WHITE VERSION British actress Emma Watson poses on May 16, 2013 as she arrives for the screening of the film 'The Bling Ring' presented in the Un Certain Regard section at the 66th edition of the Cannes Film Festival in Cannes. Cannes, one of the world's top film festivals, opened on May 15 and will climax on May 26 with awards selected by a jury headed this year by Hollywood legend Steven Spielberg. AFP PHOTO / ANNE-CHRISTINE POUJOULAT (Photo credit should read ANNE-CHRISTINE POUJOULAT/AFP/Getty Images)