Katy Perry says she needs a
Katy Perry says she needs a "liver transplant" after partying with Rihanna for her bachelorette bash. My Secret Playlist

Bachelorette Katy wakes up in Vegas

KATY Perry needs a "liver transplant" after partying with Rihanna for her bachelorette bash.

The 'I Kissed a Girl' singer - who is engaged to Russell Brand - enjoyed a "risque" night with around 25 female friends in Las Vegas on Saturday night (18.09.10), including her pop star pal, ahead of her upcoming wedding ceremony.

She tweeted: "Signing up for a liver transplant now."

According to OKmagazine.com, the group wore "typical risque bachelorette-themed party items" - with Katy wearing a hat and veil with the word "Bride" attached - as they enjoyed food and drinks at the Casino Tower and the Hard Rock Hotel and Casino.

The women then jumped into a stretch limousine and were driven to the MGM Grand, where they watched a performance of Ka by Cirque du Soleil.

After posing with the show's dramatically-dressed gymnasts, the group returned to Katy's hotel suite where they continued the party in private.

The 25-year-old beauty was even presented with an "erotic" cake to celebrate her last few weeks as a singleton.

Reminiscing back over the weekend, Katy wrote on twitter "That's what you get for waking up in...", a lyric from her hit single 'Waking Up in Vegas'.

It has been a hectic few days for Katy, after her fiance Russell was arrested at Los Angeles International airport on Friday (17.09.10) after attacking a paparazzi photographer for allegedly trying to take an intimate photo of her. Russell was handed the misdemeanour charge of simple battery.



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