For Friday's premiere of "Cosmopolis," Cannes 2012 mainstay Kristen Stewart ditched the Balenciaga pants and went bold, bold, bold in a sexy red Reem Acra gown -- that almost revealed more than she probably wanted.

Though she's (now pretty much confirmed to be) dating "Cosmopolis" star Robert Pattinson, Stewart walked the red carpet in the south of France with Tom Sturridge, her "On the Road" costar, and radiated sexy glam in a scarlet dress dotted with lacy cutouts.

But Stewart's plunging neckline was definitely risky, resulting in a view of some pretty daring cleavage. Luckily, it seems some double-sided tape prevented any major accidents.

Cannes has definitely been bringing out the wardrobe malfunction-risking dresses -- from totally sheer bottoms to fellow plunge-rs. Check out Kristen's dress below, and see other sideboob-baring celebs in our slideshow.

PHOTOS:

kristen stewart sideboob

kristen stewart

kristen stewart

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  • Jacket Jackson

    (Getty photo)

  • Gwyneth Paltrow

    (WireImage photo)

  • Micaela Schaefer

    (WireImage photo)

  • Kristen Stewart

    (Getty photo)

  • Julianne Hough

    WEST HOLLYWOOD, CA - APRIL 18: Actress Julianne Hough attends the Us Weekly Hot Hollywood Style Event at Greystone Manor Supperclub on April 18, 2012 in West Hollywood, California. (Photo by Imeh Akpanudosen/Getty Images)

  • Miley Cyrus

    LAS VEGAS, NV - MAY 20: Singer Miley Cyrus arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

  • Angelina Jolie

    Loaded Magazine, August 2000

  • Jennifer Aniston

    GQ, December 2005

  • Cameron Diaz

    Cosmopolitan, June 2011

  • Jessica Biel

    W Magazine, March 2012

  • Gwyneth Paltrow

    Harper's Bazaar, March 2012

  • Lauren Conrad

    Glamour, May 2012

  • Anne Hathaway

    New York, March 2005 (Photo Credit: Getty Images)

  • Giselle Bundchen

    New York, May 2008 (Photo Credit: Getty Images)

  • Lindsay Lohan

    Los Angeles, July 2009 (Photo Credit: Getty Images)

  • Lindsay Lohan

    Malibu, July 2009 (Photo Credit: Getty Images)

  • Katy Perry

    Los Angeles, January 2010 (Photo Credit: Getty Images)

  • Audrina Patridge

    Las Vegas, May 2010 (Photo Credit: Getty Images)

  • Rachel McAdams

    London, January 2011 (Photo Credit: Getty Images)

  • Rosie Huntington-Whiteley

    London, June 2011 (Photo Credit: Getty Images)

  • Diane Kruger

    Beverly Hills, December 2011 (Photo Credit: Getty Images)

  • Calvin Klein

    1992

  • American Apparel

  • American Apparel

  • Jil Sander

    Fall 2010

  • Guess Jeans

    Spring 2012


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