Katy Perry got touched up by barman Moe during a cameo appearance on The Simpsons at the weekend.

Moe accidently went down on the singer during a special live-action segment in this year’s Christmas special.

In the episode, Perry appeared in a dream of Maggie’s as Moe’s girlfriend and later singers ’39 Days Of Christmas’.

The incident involving the singer and Moe took place during the credits when the barman tried to kiss her.

"I'll just kiss your belly button," he said, before Perry replied: “That's not my belly button!"

As Moe pulled away, the singer replied: "But I didn't say stop!"

Perry was given the cameo after a scheduled appearance on Sesame Street this year was deemed too controversial for broadcast.

(by Jason Gregory)