Katy Perrys bum note on night out

The Firework singer headed to London nightclub Cirque Du Soir last night, sporting a pretty transparent blouse and black and white skirt.

But as she left the bash in the early hours of the morning, she accidentally flashed her bum as she squeezed past a bollard.

Katy's fella, Florence + The Machine guitarist Robert Ackroyd, also put in an appearance at the night.

Rob was in the pit at Wembley singing along to her set but he didnt know the words.

The pair have been spending a lot of time together recently, heading out on a date at a bowling alley earlier this week.

But an appearance on the Graham Norton show saw her hint that she might have more than one bloke on the go.

When the host asked her if she was single, she replied: My dance card is full Im just not sure who Im dancing with."

She went on to cheekily joke that she has people call round in the middle of the night to satisfy her needs.

Night out ... Katy Perry

Splash News

And Prince Harry should think about giving the 28-year-old singer a call as she declared her love for the royal, calling him a "hot ginger".

Even pop pal Rihanna isn't safe from the Teenage Dream singer.

When asked about the possibility of a musical collaboration with Rihanna earlier this month, Katy replied: "No, but we're going to have sex."