Ke$ha: Radio 1's Big Weekend!

Ke$ha dons a patriotic pair of booty shorts as she hits the main stage at Vaynol Park during Day 2 of Radio 1′s Big Weekend music festival on Sunday (May 23) in Bangor, North Wales.

The 23-year-old singer’s tourmate, Rihanna, also performed at Big Weekend.

In addition, British pop group JLS — Marvin Humes, Aston Merrygold, Oritse Williams, and JB Gill — performed a 20-minute set including songs “Beat Again,” “Everybody In Love” and “Only Tonight,” where rapper Chipmunk joined them on stage.

20+ pictures inside of Ke$ha and JLS performing at Radio 1′s Big Weekend…