Katy Perry - Katy Perry, Carly Rae Jepsen Competing In Summer Jam Games
Katy Perry, Carly Rae Jepsen and her mentor Justin Bieber are among the acts going head-to-head for the song of the summer (12) in an Olympics-inspired music contest.
The inaugural Summer Jam Games will pit chart-toppers including Flo Rida, Maroon 5, Rihanna, No Doubt, Kanye West, Pink and Nicki Minaj against one another in hip-hop, pop and R&B categories.
The winners of the MTV competition, which runs alongside London's Olympic Games, will receive gold medals, while second and third runners-up will take home silver and bronze prizes.
A full list of winners will be announced at a medal ceremony on 5 August (12) - a week before the official closing ceremony caps off the 2012 Olympics in the U.K.