Rihanna throws a hen party for Katy Perry in Las Vegas

Last Updated: Sep 20, 2010, 09:16 AM IST

London: Her fiance may have been arrested for assault the same day but pop star Katy Perry let her hair down at her hen party thrown by best friend Rihanna.

The `California Gurls` hitmaker`s fiance Russell Brand was arrested at the airport after a scuffle with a paparazzo, but she went ahead for a girls night out in Sin City, reported Daily Mail.

For her send-off into married life ahead of her October wedding to Brand, the bride-to-be was treated to a production of `Ka` by Cirque du Soleil.

The singers, who became close after holidaying together in Barbados last year, both dressed up for the occasion.

Perry appeared to have enjoyed the night, tweeting the next morning, "Signing up for a liver transplant now..."

The 25-year-old singer had got engaged to the British comedian in India over the last New Year.

The comedian, 35, was charged with battery after attacking a photographer who attempted to take an up-skirt picture of his fiance.

He was caught on camera punching the paparazzo in the face and was placed under citizen`s arrest by another photographer until airport police arrived.

Perry jumped to Russell`s defence, saying on Twitter, "If you cross the line and try an put a lens up my dress, my fiance will do his job and protect me."

PTI