Teen Choice Awards 2012: Justin Bieber to Perform; Demi Lovato to Host

X Factor USA judge Demi Lovato and "Glee" star Kevin McHale will co-host the "Teen Choice 2012 Awards" tonight.

"Teen Choice 2012" celebrates the hottest teen stars in television, music, film, sports, fashion, comedy and the web.

The live special will feature performances by Justin Bieber, Carly Rae Jepsen, Flo Rida, No Doubt and DJ Pauly D, who will serve as "Choice" DJ for the night.

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Announced participants include Troian Bellisario, Ashley Benson, Miley Cyrus, Zooey Deschanel, Ellen DeGeneres, Jason Derulo, Zac Efron, Selena Gomez, Lucy Hale, Josh Hutcherson, Victoria Justice, Laura and Vanessa Marano, Bridgit Mendler, Lea Michele, Shay Mitchell, Tyler Posey, Gordon Ramsay, Dax Shepard, Sophia Grace and Rosie, Jordin Sparks and Taylor Swift. Miranda Cosgrove, Zachary Knighton, Adam Pally, Hayden Panettiere, Zoe Saldana, Damon Wayans, Jr. and Shane West

"Demi and I have been friends for years, and I'd like to thank her for letting me in on the fun co-hosting TEEN CHOICE 2012," McHale said. "It's exciting to finally be working together professionally and I'd like to welcome her to the FOX family. This is going to be a great show."

Here are 3 of the categories which teen fan get to vote on:

Choice Movie: Sci-Fi/Fantasy
The Avengers
The Hunger Games
Mirror Mirror
The Twilight Saga: Breaking Dawn - Part 1
Wrath of the Titans

Choice Movie Actor: Sci-Fi/Fantasy
Robert Downey, Jr., The Avengers
Chris Hemsworth, The Avengers
Josh Hutcherson, The Hunger Games and Journey 2: The Mysterious Island
Taylor Lautner, The Twilight Saga: Breaking Dawn - Part 1
Robert Pattinson, The Twilight Saga: Breaking Dawn - Part 1

Choice Movie Actress: Sci-Fi/Fantasy
Lily Collins, Mirror Mirror
Vanessa Hudgens, Journey 2: The Mysterious Island
Scarlett Johansson, The Avengers
Jennifer Lawrence, The Hunger Games
Kristen Stewart, The Twilight Saga: Breaking Dawn - Part 1

You can view lthe entire list of nominees here at Wet Paint.

"Teen Choice 2012" airs tonight (Sunday) from 8-10PM ET live/PT tape-delayed) on FOX.