20/09/2010 14:49 BST | Updated 22/05/2015 10:12 BST

What A Circus: Rihanna Throws Katy Perry A Hen Night In Vegas

Katy Perry and RiRi pose backstage with the cast of Ka. Getty Images

Katy Perry
loves a spectacle, so what better way to celebrate her hen night than at the circus?

Rihanna threw her BFFa hen party to remember in Las Vegas, which included a performance of Ka by Cirque du Soleil at the MGM Grand. The duo went backstage after the show, posed for pictures and fooled around with the cast, and for once, RiRi and Katy weren't the most theatrically dressed in the room...

RiRi went for a tame minidress with lacing down the sides, while Katy swapped her signature fabric of late - latex - for a sequinned mini with multicoloured spots, which she paired with sparkly silver sandals and a veiled bridal headpiece.

After the festivities - which included a pool party earlier in the day at the Hard Rock Hotel Casino (and apparently a lot of boozing)- Katy Tweeted: 'Signing up for a liver transplant now...'

Well, you know what they say about Vegas.

What do you think of the singers' hen night style?

Katy Perry goofs around backstage. Getty Images

Fashion face-off: whose outfit do you prefer? Getty Images

The duo pose for pics backstage. Getty Images