(Cover) - EN Showbiz - Rihanna threw Katy Perry her bachelorette party last night.

Katy is engaged to British comedian Russell Brand. He proposed following a whirlwind romance on New Years Eve last year, and although the pair are happy to discuss their love for each other neither has confirmed when the nuptials will take place. It is believed the ceremony will happen next month.

Katy and 25 guests started the day at Las Vegas' Hard Rock Hotel Beach Club swimming pool, where they relaxed and drank champagne, beer and vodka. While topping up their tans, the group also munched on snacks.

The singer hinted something big was planned on Twitter, writing: Signing up for a liver transplant now.

Later, Katy and her friends took a stretch Hummer limousine to watch the Cirque Du Soleil perform KA at the MGM Grand Hotel and Casino. They met the cast afterwards, and then went for dinner at Ago.

Following their food, the group partied at XS nightclub. They had a VIP table to sit at, and Katy wore a short black dress and a miniature top hat headpiece.

The party ended the night at Sapphire strip club, where Katy was treated to a dance by one of the blonde employees.

On Friday, Russell was arrested at a Los Angeles airport after allegedly attacking a photographer who Katy has said was trying to take an inappropriate picture of her. (C) Cover Media