Nicole Richie Britney Spears dance videoNever one to back down from a battle, after being challenged to a Britney Spears dance-off by a friend, Nicole Richie got to work -- and the girl's got moves! The reality star turned fashion designer turned author turned dancer filmed herself getting down to Spears' 'I'm a Slave 4 U.'

"In honor of my queen @BritneySpears," Richie tweeted along with the video.

Richie sports a low cut cream tank top and super short denim cut-offs as she and a male friend get down to the sexy tune, before she takes the dance reins solo.