RIHANNA THEW BFF KATY PERRY A BACHELORETTE PARTY IN VEGAS...

Cute white dress, Riri! Yup-- Rihanna took her bff Katy Perry to Vegas to celebrate her upcoming nuptials to actor Russell Brand. Looks like they had a great time too. Rihanna went all out. That's them pictured with the cast of Cirque du Soleil. Must be nice to have Rihanna for a best friend. [Source]