Katy Perry serenaded by fans

Katy Perry was serenaded by 14,000 fans during a gig in Belfast on Monday, as they sang Happy Birthday to the star.

The Teenage Dream singer turned 27 on Tuesday and she took to the stage on the eve of her big day.

During a break in the set, the audience sand to the birthday girl and he dancers brought on a colourful cake, which Perry shared by throwing it into the crowd.

She said: "Thank you so much, I wouldn't have it any other way than celebrating with you!"