Jessica Simpson was in Vegas hosting the 2nd Anniversary Party for the Pussycat Dolls at Pure on Friday night. Jess brought along pals: Eva Longoria, hair stylist Ken Paves, and Mario Lopez to help celebrate.
Other celebrities were in Vegas for the De La Hoya and Mayweather fight and attended an after party Saturday night - hosted by Jay Z. Check out: Jennifer Lopez and Marc Anthony, Usher and girlfriend Tameka Foster, Fred Durst, Jermaine Dupri, Macy Gray, Nelly and girlfriend Ashanti, Danny Masterson, and Jack Osborne.