Katy Perry celebrated one of her last nights of “Singledom” by hooking up with pop BFF Rihanna and taking on Las Vegas for a Hens’ Night that left her begging for a “liver transplant” the next morning on Twitter.

The “Teenage Dream” singer hit Sin City on Saturday with her “Umbrella” singing party planner, an arsenal of inflatable toys, and an entourage of 25. Katy’s bachelorette party kicked off at Hard Rock Hotel & Casino, where the star enjoyed cocktails with friends by the hotel’s pool.

We hear Katy even got her own private dance from a female stripper after checking out a Cirque di Soleil show then hitting the city’s famed nightspots. Katy even gave her white bikini a bridal touch by attaching a veil to the back of the swimsuit.

The celebration came just 24 hours after Perry’s fiance, British comedian Russell Brand, was taken into custody at Los Angeles International Airport after a run-in with a photographer, who allegedly tried to take an upskirt photo of Katy.

These snapshots of Katy and Rihanna with some of the Cirque du Soleil performers are kinda dying for a smart-assed caption. Got anything in mind?

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