The I Kissed A Girl singer asked all partygoers to arrive wearing white but little did they know (okay, maybe they did know) that once inside they’d get splattered with multi-coloured paint. (CLICK HERE to see a load of inside access pictures!)

Celebrity guests included country music star Taylor Swift, music mogul P Diddy and of course Katy’s boyfriend Russell Brand.

The next afternoon we caught up with Katy and Russell popping to the Four Seasons Hotel in Beverly Hills for a bite to eat, unfortunately there was no sign of the feeding farm Russell was rumoured to have bought Katy for her special day, shame!