Katy Perry Celebrates Last Days Of Single Life With Rihanna

"Waking Up In Vegas" may have been a bit painful this weekend for pop star Katy Perry.

The "Teenage Dream" singer hit Sin City on Saturday with pal and party planner Rihanna, inflatable toys and an entourage of 25, to celebrate one of her last nights of being a single lady.

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Her bachelorette party kicked off at Hard Rock Hotel & Casino, where Katy, who gave her white bikini a bridal touch by attaching a veil to the back of the swimsuit, enjoyed cocktails with friends by the hotel's pool.

The group then made their way to the MGM Grand Hotel, arriving in style via stretched Hummer limo where they took in a performance of Cirque du Soleil's "KA," before heading to dinner.

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The festivities continued after dinner, as the group headed to Sapphire strip club, where the dancers danced to Katy's songs. Though she may not have "Kissed A Girl," Katy did receive a lap dance from a female dancer at the club, according to People.

As previously reported on AccessHollywood.com, planning the bachelorette bash was time-consuming for friend and fellow superstar Rihanna.

"Planning Katy Perry's bachelorette party is taking up way more time than my tour," Rihanna joked to Access in July. "It's so much pressure. Her wedding is like probably going to be the best wedding I've ever been to and now I have to match the bachelorette party to that."

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Katy seemed satisfied with Rihanna's efforts and jokingly Tweeted on Saturday, "Signing up for a liver transplant now."

The partygoers concluded their fun-filled evening in their suite at the Casino Tower, where an erotic-themed cake was delivered to the "Teenage Dream" singer.

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The celebration came just one day after Katy's fiance, Russell Brand was subjected to a citizen's arrest after an altercation with a paparazzo at Los Angeles International Airport.

The chart-topper immediately defended her man via Twitter, writing, "If you cross the line & try an put a lens up my dress, my fiance will do his job & protect me."

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