Katy Perry hit Sin City this weekend for her bachelorette party.  Rihanna hosted the bride-to-be’s festivities which began in a stretch Hummer convertible arriving at the MGM Grand Hotel/Casino in Las Vegas on Saturday (Sept. 18). 

Katy, Rihanna and an entourage of about 25 attended an early performance of ‘Ka’ by Cirque du Soliel followed by a backstage visit with the cast.

The party continued with stops at Ago, XS nightclub and the Sapphire strip Club.

The pop-singer is set to wed comic Russell Brand this fall.  The couple missed their flight out of LAX after Brand was arrested and charged with a misdemeanor of simple battery after an altercation with paparazzi.  He was released on $20,000 bail.  Katy defended her future husband’s actions saying,  “If you cross the line & try an put a lens up my dress, my fiancé will do his job & protect me.”