If Katy Perry  crashed our hen do, we’d be pretty excited, mainly because she always looks well fun, but also because she might bring Rihanna along, and then we’d probably have the best night of our lives.

So one girl who had her hen do over the weekend at Mahiki must have been  chuffed – when Katy, wearing a dress that made her lovely boobs almost spill out, turned up and had a little drink with her, as she got ready to get married.

Er, slightly awkward, since Katy’s just split up from her husband, but hey – hopefully Katy didn’t get wrecked and start shouting ‘DON’T DO IT, HE’LL LEAVE YOU’ in her face.

After having a drink with the bride and wishing her luck, Katy was spotted heading off into a private room where she and some mates were downing coconut rum and champagne, before getting on the karaoke machine.

“They got straight into singing the hits including Katy’s I Kissed A Girl,” a source told The Mirror. “It was hilarious and she had the group in stitches. She looked determined to forget about all her woes with Russell and let loose for the night instead.”

Earlier in the night Katy had been for dinner at Nobu, after performing on Let’s Dance for Sport Relief.

Meanwhile Russell is off doing yoga and being arrested. Katy’s break-up style is so much more our bag.