Is it love or will Katy be left broken and hurt?

Will John Mayer break Katy Perry's heart?

Katy Perry's loved ones are worried about her dating perceived bad boy Mayer, sometimes dubbed a serial womanizer, as they fear she will get hurt.

The 27-year-old singer has been dating the 34-year old guitarist for a couple of weeks and they seem inseparable for now.

Is it love or will Katy be left broken and hurt?

Mayer's celebrity conquests have included Jennifer Aniston, 43, Cameron Diaz, 39, Jennifer Love Hewitt, 32, Kim Kardashian, 31, and Taylor Swift, 22, amongst others.

A source says most of Katy's inner circle, as well as ex-husband Russell Brand, 36, are worried about her choice of partner.

An insider told the Daily Star newspaper: ''John has a big reputation as a serial womaniser. If people thought her ex, Russell Brand, was bad, John is notoriously a lot worse.

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

John - who also dated Jessica Simpson, 32, in between her relationships with Nick Lachey and Eric Johnson - famously described his time with Jessica as similar to taking drugs.

He said: ''That girl is like crack cocaine to me.

''Sexually it was crazy. That's all I'll say. It was like napalm, sexual napalm. Did you ever say: 'I want to quit my life and just f**king snort you?'''

© Bang Showbiz