The 39-year-old WWE star and 23-year-old singer confirmed as much on their respective Twitter accounts after Fox announced the news in a press release Tuesday.
"I'm excited that you can see ME and @VictoriaJustice host @TeenChoiceFOX LIVE Sunday, July 31st! #TeenChoice," Cena tweeted.
"Surprise! Excited to announce I'll be co-hosting the 2016 @TeenChoiceFox Awards w/ @JohnCena on July 31! #TeenChoice," Justice wrote.
The 2016 Teen Choice Awards will air live Sunday, July 31 at 8 p.m. ET. Cena is nominated for Choice Male Athlete, along with Kobe Bryant, Stephen Curry, Peyton Manning, Roman Reigns and Cristiano Ronaldo.
Fox also announced singer Charlie Puth and Empire star Serayah as the first of several performers. Puth, who is nominated for Choice Music Breakout Artist, will perform his single "We Don't Talk Anymore."
Cena is a 12-time WWE Champion who also hosts the Fox reality competition American Grit. Justice, meanwhile, is known for Nickelodeon's Zoey 101 and Victorious and will play Janet in Fox's forthcoming Rocky Horror Picture Show remake.