The Part of Me star hit the tiles at trendy nightspot Cirque du Soir, where she spent time mingling with Justin, Jessie and her rumoured beau Robert Ackroyd.
However, the brunette beauty seemed to enjoy her night out a tad too much, as she reportedly stumbled to the floor in the early hours.
"Katy was in high spirits and very excited that Justin was there, as she loves Justin. And she's good friends with Jessie, so they had a catch-up," a source told British newspaper The Mirror. "Before long Katy had sunk a fair few vodka cocktails.
She had big bottles of Ciroc and Belvedere on her table. By 5am she seemed to be having some difficulty walking and suddenly fell to the floor. She was down for a while and it took a couple of her mates to get her up. Everyone was staring and there was quite a commotion."
Source:
http://www.belfasttelegraph.co.uk/en...-16170673.html
Oh, Katy... Well can't say I haven't done anything stupid before, either. 
