The awards show will air Sunday, Aug. 10 at 8 ET/PT. Fox also announced that Magic!, the Canadian reggae fusion band responsible for hit "Rude," and English boy band Rixton will perform, joining the previously-announced Jason Derulo.
Posey stars as Scott McCall on MTV's "Teen Wolf," currently in its fourth season. At last year's show, he won the award for choice male summer TV star, while the series nabbed the award for choice summer TV show. McCall will star next in comedy "Taco Shop," set to premiere next year.
Previously announced star appearances include Jake T. Austin, Cody Simpson, Big Show, Gregg Sulkin, Hailee Steinfeld, Zendaya, Bella Thorne and "Pretty Little Liars" stars Keegan Allen, Tyler Blackburn, Lucy Hale and Ian Harding.
The Teen Choice Awards determines winners by votes, taken from those aged 13-19. Bob Bain and Michael Burg exec produce the fan-voted show. Producers are Paul Flattery and Kelly Brock, with Greg Sills as supervising producer.
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