Justin Bieber, Rihanna, JLS And Ke$ha Do The Capital FM Summertime Ball

The annual Captial FM Summertime Ball went down at London’s Wembley Arena on Sunday, and the pop extravaganza featured performances by Justin Bieber, JLS, Rihanna, Ke$ha, Usher, Pixie Lott and Jason Derulo. “It was terrifying,” said feather aficionado Ke$ha, who’s no stranger to the radio festival circuit, during an interview backstage. “It’s really fun to just go up there and be a smartass in front of 70,000 people.” Catch Ke$ha and Justin Bieber’s interviews, plus some of the performances, after the jump.

Justin Bieber performs “Baby”

Justin Bieber backstage interview

Ke$ha performs “TiK ToK”

Ke$ha backstage interview

JLS perform “The Club Is Alive”

Rihanna performs “Rude Boy”

Usher performs “OMG”

Jason Derulo performs “In My Head”