Kaley Cuoco, who stars in the CBS comedy "The Big Bang Theory," will host "Teen Choice 2011," Fox announced on Tuesday.

The network -- which will air the awards ceremony live on August 7 at 8 p.m. ET -- also announced that "Wizards of Waverly Place" star Selena Gomez will perform with her band The Scene. "Apologize" group OneRepublic will also perform.

Cuoco will assume hosting duties from "Teenage Dream" chanteuse Katy Perry, who handled the task last year.

Fox also revealed the nominees for the category of Choice Vampire. Vying for the honors are "Twilight Saga" stars Robert Pattinson and Nikki Reed; "True Blood" favorite Alexander Skarsgard; and Nina Dobrev, Paul Weslay and Ian Somerhalder from the CW series "Vampire Diaries."