Watch Britney Spears' "Live" Performance At Rain Nighclub In Las Vegas

Weaveney Spears generously performed an exhausting set of three whole songs at Rain nightclub in Las Vegas' Palms casino and resort last night—Femme Fatale's "Hold It Against Me," "Big Fat Bass" and "Till The World Ends."

But let's just answer the question on everyone's minds: Oops!...They Forgot To Turn On Lipsyncney's Mic Again. At least it was a lot more actual dancing than we got to see in the HIAM video. (Of course, Britney getting up and making a sandwich would have been more movement than we saw from her in that clip...)

Marvel at Her Wigship below. The performance was taped for MTV for a special set to coincide with next week's release of Femme Fatale, so expect classier clips this week.

"Big Fat Bass"



"Hold It Against Me"



"Till The World Ends"