Nicole Richie Pals Around With Britney Spears Onstage In Las Vegas

Nicole Richie got the VIP treatment on Tuesday night when she was brought onstage during Britney Spears Las Vegas show, and she unleashed her inner fangirl when she held up a concert tee and freaked out in front of the pop star.

Richie also crawled around on the stage while Spears walked her on a leash, and she got to hang with the singer after the show as well. "Can we all give a round of applause to @NicoleRichie for playing along in the show tonight?" Spears tweeted this morning. "U looked hot crawling on all fours." Richie later tweeted, "Am I alive?"

What happens in Vegas sometimes ends up on Instagram ... but we're glad the ladies shared these snapshots!