Wowlebrities unite! Find out who joined Britney Spears‘ on stage during the Britney: Piece Of Me show in Sin City last night! 

OMG it’s Nicole Richie! #CandidlyNicole joined I Am Britney Jean on stage Tuesday night for a kinky performance of “Freakshow.”  They shared a hug then Nicole was on all fours while Britney walked her around the stage on a leash! She made her work, B**CH!

Photos via Nicole Richie’s Instagram