Katy’s got a Perry nice bum!

JUST what we need when polar winds are shivering our timbers – Katy Perry, on a boat somewhere hot and showing off her delightful trumper.

The singer, 34, made us hark back to sunnier times when this snap appeared on a pal’s Instagram feed.

A fan said: “I’ve got the winter sniffles and the shivering shits but this photo of Katy Perry in a bikini has cheered me right up. Hooray!”