Teen Choice Preps: This Year's Big Surprises

ET's Brooke Anderson went behind the scenes with Teen Choice Awards co-host Tyler Posey as he prepped for Sunday's show, getting the young actor to tease what surprises are in store for fans this year.

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The Teen Wolf star, 22, confirmed that one of Hollywood's power couples will be in attendance on Sunday, but their names will remain a mystery until the show.

"I'm going to be surprised," said Tyler. "I have no idea who they are."

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What Tyler does know is that there will be some must-see performances by some amazing artists, including Rixton, Magic!, Demi Lovato, Rita Ora and more.

"That's one of my favorite parts about the Teen Choice Awards -- I get to see all these awesome bands play live that I would never get the chance to see otherwise," said Tyler.

Tyler co-hosts the 2014 Teen Choice Awards alongside 23-year-old Modern Family star Sarah Hyland. Be sure to catch the show airing Sunday, August 10, live on FOX.