Singer Rihanna sexed it up on stage last night (Sun. May 23) as she performed during Day 2 of Radio One’s Big Weekend in Bangor, Wales.

Other performers Sunday night were Ke$ha and Jason Derulo. And Justin Bieber took the stage Saturday night during Day 1 of the weekend concert series.

Check out 15+ pictures of Rihanna, Ke$ha and Jason Derulo performing at Radio One’s Big Weekend (Day 2) below…