Katy Perry's bachelorette party a hit, thanks to Rihanna!

Tick-tock. Time's winding down for your hot single lady.

But that's not stopping Katy Perry from having a ball at her own bahelorette party, with a hand from close friend Rihanna.

The California Girls singer celebrated the last of her single status in Las Vegas on Sept.18, Saturday, with a group of 25 galpals, as she looks forward to exchange vows with comedian beau Russell Brand.

Perry sported a white bikini with a veil hanging from the back of her bikini bottom during the momentous event. The party commenced at poolside at the Hard Rock Hotel Beach on Saturday, reveals People.

Later on, the pop princess proceeded to the MGM Grand Hotel/Casino along with Rihanna and the gang to witness a performance of Cirque Du Soleil's "KA." After dinner, everybody chilled at a VIP table at XS nightclub and topped off by checking out the Sapphire strip club.

A day before that, fiance Russell Brand was arrested at the LA airport after a scuffle with a paparazzo, who allegedly had his lens up in the wrong place. Keep the skirt short next time, Katy.

Enjoy it while you can sweetie, because your partying days are over!