Jennifer Aniston MTV Movie Awards 2012 Outfit Is Very, Er, Fitting (PHOTOS)

"Dirtbag" is not a word we often aim at Jennifer Aniston, she of the sweet "Rachel" haircut and propensity for crying.

But we were reminded of the star's dirty streak at last night's MTV Movie Awards, where Rachel -- er, Jennifer -- picked up the Best On-Screen Dirtbag Award for her role as a sex-crazed dentist in "Horrible Bosses" (yeah, we'd forgotten about that movie, too).

According to JustJared.com, Aniston accepted her gold popcorn statue (no naked gold men here) with a shout-out to her director: "I would like to say thank you to the television show Friends for letting me unleash my inner sweetheart and [Horrible Bosses director] Seth Gordon for letting me channel my inner dirtbag."

She could've just as easily thanked her stylist. Since getting together with Justin Theroux, Jen's beachy California style has gained a slight rocker edge; consider the transition complete with last night's outfit, a tight black leather minidress by Valentino paired with strappy black Giuseppe Zanotti heels.

Black leather might just be Jen's new signature: she killed it in leather leggings on "The Tonight Show" earlier this year and reportedly purchased Theroux a $12,000 vintage leather jacket once worn by James Dean for his birthday.

We're hoping her teeny Valentino dress didn't cost that much -- there wasn't that much of it.

Check out Jen's "dirtbag" fashion statement from the 2012 MTV Movie Awards. Are you a fan of the 43-year-old star in this sexy LBD? Also, be sure to check out Stylelist's picks for best- and worst-dressed.

PHOTOS:

See Jen Aniston's style evolution!

Loading Slideshow

• July 1990

  Photo: Barry King/WireImage

• 1994

  Cast of "Friends" (left to right): Lisa Kudrow, Matthew Perry, Jennifer Aniston, David Schwimmer, Courteney Cox Arquette and Matt Leblanc. Photo: Getty Images

• June 1995

  Photo: Terry McGinnis/WireImage

• July 1997

  Photo: Ke.Mazur/WireImage

• April 1998

  Photo: Kevin Mazur Archive/WireImage

• September 1999

  Photo: Jeff Vespa/WireImage

• March 2000

  Photo: SGranitz/WireImage

• March 2000

  Photo: Evan Agostini/Getty Images

• September 2000

  Photo: Scott Gries/ImageDirect

• January 2001

  Photo: Scott Nelson/AFP/Getty Images

• February 2001

  Photo: Kevin Winter/Getty Images

• January 2002

  Photo: LUCY NICHOLSON/AFP/Getty Images

• May 2002

  Photo: LUCY NICHOLSON/AFP/Getty Images

• June 2002

  Photo: Amy Graves/WireImage

• September 2002

  Photo: Gregg DeGuire/WireImage

• January 2003

  Photo: Robert Mora/Getty Images

• September 2003

  Photo: Jeffrey Mayer/WireImage

• January 2004

  Photo: Carlo Allegri/Getty Images

• February 2004

  Photo: Dave Hogan/Getty Images

• May 2004

  Photo: Evan Agostini/Getty Images

• September 2004

  Photo: Kevin Winter/Getty Images

• October 2005

  Photo: Evan Agostini/Getty Images

• March 2005

  Photo: Evan Agostini/Getty Images

• March 2006

  Photo: David Livingston/Getty Images

• May 2006

  Photo: Frederick M. Brown/Getty Images

• May 2006

  Photo: James Devaney/WireImage

• June 2006

  Photo: Patrick Riviere/Getty Images

• June 2006

  Photo: Sean Gallup/Getty Images

• October 2006

  Photo: Kevin Winter/Getty Images

• December 2006

  Photo: Charley Gallay/Getty Images

• January 2007

  Photo: Stephen Shugerman/Getty Images

• April 2007

  Photo: Mark Davis/Getty Images

• December 2008

  Photo: Kevin Winter/Getty Images

• February 2009

  Photo: Frederick M. Brown/Getty Images

• February 2009

  Jason Merritt/Getty Images

• March 2009

  Photo: Gareth Cattermole/Getty Images

• May 2009

  Photo: Andrew H. Walker/Getty Images

• June 2009

  Photo: Frazer Harrison/Getty Images

• September 2009

  Photo: Frederick M. Brown/Getty Images

• January 2010

  Photo: Kevin Winter/Getty Images

• March 2010

  Photo: Ian Gavan/Getty Images

• March 2010

  Photo: Stephen Lovekin/Getty Images

• March 2010

  Photo: Pascal Le Segretain/Getty Images

• March 2010

  Photo: Carlos Alvarez/Getty Images

• August 2010

  Photo: Jason Merritt/Getty Images

• February 2011

  Photo: Andreas Rentz/Getty Images

• March 2011

  Photo: VIctor Chavez/WireImage

• July 2011

  Photo: Dave M. Benett/Getty Images

• July 2011

  Photo: Gareth Cattermole/Getty Images

• September 2011

  Photo: James Devaney/WireImage

• September 2011

  Photo: Jason Kempin/Getty Images

From our partners

• Easy Summer-Hairdos - Allure.com
• You've Probably Never Heard Of These Influential Designers - Fashionista.com
• Great Time-Saving Beauty Tips - Refinery29.com

Comments

[dayanatuna]

09:13 AM on 07/03/2012

Love her outfit. :D

[Leilani lei]

08:16 PM on 06/17/2012

I really like Jennifer, but I can never see pull off the "sexy" thing ever. I see her as classic - Calvin Klein, Armani, and Carolina Herrera, but she's not that Versace Girl.

[azbenahmed]

03:27 PM on 06/11/2012

Jennifer Aniston is well known for her love of the LBD, the fact that this one is leather makes no real difference.. it's not shiny cheap tight leather.. she's wearing minimal make up, no accessories and simple black heels. The woman is pure class, I think she killed it as always.

[michelle coop]

12:54 AM on 06/06/2012

Stoner eyes!!! She's outta it!

[FMTalks]

03:53 PM on 06/05/2012

No matter how good she looks, it's not enough to get her a good film. She is the queen of MEH films.

[Mailman]

11:33 AM on 06/05/2012

It's like getting a trophy for competing. Anything for an award of some kind. It's the attention.

[branecoke]

11:13 AM on 06/05/2012

Only one word for how Jennifer looked in that rag, "sleezy".

[Highball]

10:18 AM on 06/05/2012

Dayum, GIRL!

You look like a million bucks!

[SamAtters]

08:59 AM on 06/05/2012

I've always thought Jennifer Aniston was so classy. I can't imagine living my life under a microscope. But she does it so well.

[Highball]

10:25 AM on 06/05/2012

Well said.

She's one of the nicest, classiest people out there. That's a grueling life, every little thing you do/wear/say/whatever completely over-analyzed. And she's always been above it all.

I really like her.

[azbenahmed]

03:24 PM on 06/11/2012

Couldn't agree more.

[Rocketr Hulsey]

07:56 AM on 06/05/2012

I would have so liked to watch this show, but someone needs to take Russell Brand out to the yard and hose him off. How does someone always look dirty?

Dress looks like it's from a Bedrock Boutique.

[MrEthiopian]

12:11 AM on 06/05/2012

She needs someone.

[Lindeen]

02:16 AM on 06/05/2012

Why?

[Highball]

10:25 AM on 06/05/2012

She needs me. :)

[nunuit505]

12:02 AM on 06/05/2012

Wow, one photo, and it's the girl who was at the counter at Midas, and then you saw her later at I Hop - while you were stuck waiting for parts. You ate fast food, and experienced a new more lax self while obsessing on the girl on the Rigid Calendar . At one 10,000 of a second, Jennifer is exposed.

[future primitive]

11:57 PM on 06/04/2012

She's in great shape. The dress is not that tight and it's a tasteful length too. Non story.

[originalxdj]

11:56 PM on 06/04/2012

Very few women could pull wearing that outfit off. Good thing she's one of them.

[ruhaba]

11:44 PM on 06/04/2012

Beautiful inside and out !