The actress, 23, will present the ceremony with TV heartthrob Posey in Los Angeles on August 10, reported Contactmusic.
Taylor Swift, Megan Fox, Hilary Duff, Josh Hutcherson, Bella Thorne, Ansel Elgort, Victoria Justice, Collins Key, Laura and Vanessa Marano, Ian Somerhalder and Ariana Grande, among others are set to attend this year's event.
Artistes like Demi Lovato, Rita Ora, Jason Derulo, and bands Rixton and Magic! will perform at the awards, which will go live on FOX.