Inside Katy Perry's Vegas Bachelorette Bash With Rihanna
- Photo: Splash News1 of 8
- Photo: Jordan Strauss/WireImage.com2 of 8
- Photo: Kevin Mazur/WireImage.com3 of 8
- Photo: Smart Pictures, PacificCoastNews.com/PacificCoastNews.com4 of 8
- Photo: KCSPresse / Splash News/Splash News5 of 8
- Photo: Charles Sykes/Invision/AP6 of 8
- Photo: Steve Granitz/WireImage.com7 of 8
Bride-to-be Katy Perry woke up in Vegas on Sunday -- after a wild night out!
Set to wed British comic Russell Brand this fall, Perry, 25, hit Sin City on Saturday night with best friend Rihanna and 25 other guys and gals for an epic bachelorette party.
Before heading out for the night, Perry jokingly Tweeted about her upcoming night of Las Vegas debauchery: "Signing up for a liver transplant now." She then quoted 9-year-old Willow Smith's club banger: "I whip my hair back 'n forth."
The festivities began when Perry, Rihanna and the rest of the revelers arrived at the MGM Grand in a stretch Hummer convertible. As the limo pulled up, Perry (wearing a crown) and Rihanna bopped to blasting music.
The gal pals were arm in arm as they entered the back-door entrance of the resort to check out an early performance of KA by Cirque du Soleil.
After the show, the famous singers visited with the Cirque du Soleil cast backstage, playing with their out-of-this-world costumes and complimenting the performers' amazing, freaky show.
The party continued on into the night as the crew boarded the stretch Hummer, headed for a top-secret location.
Perry and "Get Him to the Greek" star Brand, 35, got engaged over New Year's while on vacation in Jaipur, India. The "California Gurls" singer has "never connected with anybody like this," a pal told Us.
Perry's bachelorette weekend admittedly got off to a rough start: She and Brand missed their Friday flight out of LAX after he reportedly got into a scuffle with a photographer. Brand was placed under citizen's arrest and charged with a misdemeanor of simple battery. He was released on $20,000 bail.
Perry defended Brand on Twitter after the brouhaha: "If you cross the line & try an put a lens up my dress, my fiancé will do his job & protect me."
More on Wonderwall:
More from UsWeekly:
Check out Diane Kruger, Elizabeth Banks, and Kendall Jenner's style statements on OMG Celeb Fashion hosted by Wonderwall's Kirby Kristen.Watch Video »
Check out the biggest celeb makeup mistakes.Watch Video »
See how Angelina Jolie's looks have changed over the years.Watch Video »
Check out Val Chmerkovskiy, Ian Somerhalder and more shirtless stars on Instagram on today's Celebs Gone Social.Watch Video »
We look back at the Kardashian clan's Greek yachting trip on April 27.Watch Video »
From Taylor Swift to Diane Kruger, check out the celebs with the best summer street style!Watch Video »