Katy Perry`s friends worried about her relationship with John Mayer

Los Angeles: Singer Katy Perry`s friends are not happy with her relationship with singer John Mayer as he is known to be a womaniser.

"John has a big reputation as a serial womaniser. If people thought her ex, Russell Brand, was bad, John is notoriously a lot worse," a website has quoted a source as saying.

"Katy`s friends are worried this is just a rebound bit of fun but will end with her getting really hurt," the source added.

Mayer has previously dated a string of celebrities which include actress Jennifer Aniston, Cameron Diaz, Kim Kardashian, singer Taylor Swift and many more.

Perry has recently been through a divorce with British comedian Russell Brand.