Watch: Usher, Justin Bieber and Jermaine Dupri Have a B-Day Dance-Off

Justin Bieber and P.Diddy weren’t the only celebs showing off their moves at Usher’s surprise party in Los Angeles Monday night.

Biebs took to the dance floor to work it alongside the man of the hour and Jermaine Dupri, and Celebuzz has the video and pics of all the late-night fun.

Usher’s big night was filled with a star-studded house to toast his 35th b-day at Bootsy Bellows complete with surprise party pals like his former Voice co-star Blake Shelton, T.I.Miguel and manager Scooter Braun.

And it wouldn’t be an S&M-themed bash without girls “in plastic balls and with whips and chains,” according to Us Weekly.

Take a look inside at the party pics below and video above.