The singer (in Dolce & Gabbana) was nominated in eight categories, including choice male artist, choice single by a male artist ("Boyfriend"), choice male fashion icon, choice male hottie, choice twit (for social media use), choice summer song ("All Around the World," featuring Ludacris), choice love song ("Die in Your Arms") and choice male summer music star.
The presenter received noms in three categories: choice female hottie, choice music group (with her band, The Scene) and choice single by a group ("Hit the Lights").
Demi Lovato, who co-hosted the awards show with Glee'sKevin McHale, is a new judge on Fox's The X Factor alongside Simon Cowell, Antonio "L.A." Reid and fellow newcomer Britney Spears.
No Doubt -- which includes Tom Dumont, Adrian Young, Gwen Stefani and Tony Ashwin Kanal -- performed during the show.
Carly Rae Jepsen
The "Call Me Maybe" singer was set to perform during the show, where she was nominated for choice summer music star -- female, choice breakout artist and choice summer song opposite her mentor, Justin Bieber.
The Glee star was nominated for choice TV comedy actor and choice male fashion icon.
DJ Pauly D
The Jersey Shore star served as “choice” DJ for the night.
Ellen DeGeneres and Portia de Rossi
Ellen DeGeneres, who was nominated for choice comedian, walked the carpet with wife Portia de Rossi.
Hayden Panettiere will serve as a guest judge on Lifetime's Project Runway this season.
Ian Somerhalder vied for choice TV actor -- fantasy/sci-fi along with his The Vampire Diaries co-star Paul Wesley. He also was nominated for choice male hottie.
The American Idol winner presented at the Teen Choice Awards.
Justin Kirk and Crystal the Monkey
Justin Kirk, who stars in NBC's upcoming comedy Animal Practice, walked the carpet with his co-star Crystal the Monkey, of The Hangover Part II fame.
Kendall and Kylie Jenner
The sisters' E! show, Keeping Up With the Kardashians, was nominated for choice TV reality show.
The Glee star co-hosted the Teen Choice Awards with Demi Lovato.
The Glee star was nominated for choice TV actress in a comedy. She also was nominated for choice movie scene stealer -- female -- for her role in New Year's Eve.
The iCarly star was nomined for choice TV actress in a comedy.
The Twilight Saga: Breaking Dawn -- Part 1 and Snow White and the Huntsman led with seven nominations each. Twilight's Nikki Reed was cited in the category of choice movie scene stealer -- female.
The CW's The Vampire Diaries received six nominations -- more than any other TV show -- including one for Nina Dobrev as choice TV actress -- fantasy/sci-fi.
Paul Wesley is one of the stars of the CW's The Vampire Diaries, which led all TV nominees with six. The actor also was nominated for choice TV actor -- fantasy/sci-fi, along with his co-star Ian Somerhalder.
The singer was nominated in multiple categories, including choice female artist, choice female country artist, choice single by a female artist ("Eyes Open"), choice country song ("Sparks Fly") and choice movie voice (Dr. Seuss' The Lorax).
The Black Eyed Peas' Will.i.am was up for choice male fashion icon at the 14th annual awards show.
The star of Fox's hit series New Girl was nominated for two awards: choice tv actress in a comedy and choice female fashion icon.
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