Jennifer Aniston crowned dirtbag at MTV Movie Awards 2012

Jennifer Aniston is now officially the most horrible of Horrible Bosses and won Best On-screen Dirtbag at this year's MTV Music Awards. "Do you know how long I've tried to let someone unleash my on-screen dirt bag? I would like to say thank you to the TV show Friends for letting me unleash the inner sweetheart," said the actress in her acceptance speech.

Actor Johnny Depp accompanied music band The Black Keys on guitar.

The Pirates of the Carribean star received the MTV Generation Award, the show's version of a lifetime achievement trophy.

Twilight Kristen Stewart, who shared the Best Kiss Award with co-star and beau Robert Pattinson for the fourth consecutive year, paired a Guishem dress with Christian Louboutin heels.

Mila Kunis showed off her legs in a white, black and orange Fendi dress.

Lady in red Charlize Theron rocked in a Lanvin dress.

Charlize Theron pretends to beat her Prometheus co-star Michael Fassbender while presenting the award for the Best Fight.

Kate Beckinsale who was one of the celebrity presenters at the Awards looked picture perfect.

The Amazing Spiderman co-stars and real life lovebirds, Andrew Garfield and Emma Stone, took the stage together to present the award for Best Breakthrough Performance.

Actress Jessica Biel was white hot in a Chanel dress.

While actress Shailene Woodley stunned in a Stella McCartney suit, Harry Potter star Emma Watson looked chic in a pattern dress by Brood.

Comedian Russell Brand returned to the MTV stage as a host for the third time. He opened the show by poking fun of Michael Fassbender's full-frontal nudity in the movie Shame and Kim Kardashian's short-lived marriage. The actor had hosted MTV's Video Music Awards in 2008 and 2009.

Actress Shailene Woodley accepts the Breakthrough Performance Award for the movie, The Descendants.

The Hunger Games stars Elizabeth Banks, Josh Hutcherson and Chris Hemsworth at the event. The Hunger Games topped the MTV Awards sweeping away four awards out of eight nominations.

Emma Watson accepts the golden popcorn-shaped trophy for Best Cast on behalf of the rest of her co-stars from Harry Potter And The Deathly Hallows Part 2.

Kristen Stewart and the cast of The Twilight Saga: Breaking Dawn Part 1 accept the award for Movie Of The Year.

Snow White And The Huntsman co-stars Kristen and Chris Hemsworth present the award for Best Female Performance.

Handsome Chris Hemsworth andThe Italian Job star Mark Wahlberg at the event.

Electropop band LMFAO won the Best Music Award for the track, Party Rock Anthem.

Former Two And A Half Men star Charlie Sheen enjoys a good laugh.

Hilton sisters Paris and Nicky arrive at the event.