KATY Perry‘s nearest and dearest are concerned she’s dating John Mayer.

According to Britain’s Daily Star newspaper, friends are worried that the singer — who recently finalized her divorce with Russell Brand — has hooked up with notorious womanizer John.

“John has a big reputation as a serial womanizer. If people thought her ex, Russell Brand, was bad, John is notoriously a lot worse,” a source said.

“Katy’s friends are worried this is just a rebound bit of fun but will end with her getting really hurt.”

Katy recently revealed she’d quite like to be courted.

“I’m a woman who likes to be courted, strongly. Never say never, I guess you’d say. I’ll let love take the lead on that,” she said..