Smitten Katy Perry and John Mayer house-hunting in LA

KATY PERRY and JOHN MAYER have been dating for a whopping four months, which is quite an achievement by his standards.

And now pals of the pair have revealed the pop songstress and cad rocker dubbed John Player in showbiz circles are planning to move in together within weeks.

They are quietly house-hunting in Los Angeles and hope to be in a new rented pad around Christmas time.

But despite their growing commitment, some members of Katys inner circle are convinced shes making a terrible mistake by getting so serious with the notorious ladies man.

A source said: John and Katy have decided to give it a proper go and want to find a place in LA to share.

But lots of people are willing them to fail. They row a bit and have quite a turbulent up-and-down relationship, despite it only being a few months old.

Many of her friends are certain it will all end in tears.

But thats brought them closer in a way. Its given them an us against the world mentality.

Katy whose 14-month marriage to Brit comic RUSSELL BRAND ended in December last year is deliberately trying to keep the serious turn her romance is taking under wraps.

The couple have had very little support from showbiz pals, including RIHANNA, who is wary about Johns reputation for loving and leaving his girlfriends.

The singer, who won a Grammy award for his single Your Body Is A Wonderland, has left a string of broken hearts scattered around Hollywood including TAYLOR SWIFT, JENNIFER ANISTON, JESSICA SIMPSON and CAMERON DIAZ. The source added: They are together virtually every day.

They hang out at Johns place, cooking, watching movies and playing music.

They take the odd trip away but generally theyre trying to keep it behind closed doors.

But a rare public outing two weeks ago really cemented their romance.

The couple were photographed together in Katys hometown of Santa Barbara, California.

She even introduced John to her parents, who are devout Christian preachers, and took him to her local church.

And the source revealed: Introducing John to her parents was a huge step for Katy and it proves shes 100 per cent committed.

She acknowledges she rushed into it a little quickly, but she is determined to trust her instincts and follow her heart.

Despite what the cynics may think, she is looking forward to moving in with John and says shes happier than shes been in a very long time.