Watch out Hollywood, Heather Mills is heading your way!

Sir Paul McCartney's much-maligned ex-wife appears to be making good on her promise to move Stateside and has been spotted house-hunting in California.

Mills won a $50 million divorce settlement from former Beatle
Sir Paul McCartney and was recently rumoured to have purchased a luxurious apartment in New York.

The 40-year-old also announced her ambition to own a home in L.A. despite previously stating a permanent move to America would be impossible.

Mills claims she has to stay in Britain to allow McCartney access to their four-year-old daughter Beatrice.

A source tells PageSix that Mills is serious about buying property in L.A.: "She's with Prudential Realty and is giving them a really hard time, because she will only pay $1 million and refuses to budge.

"They've been showing her places for $1.1 million or $1.2 and she'll get mad, telling them, 'I said $1 million and not over.'

A spokeswoman for Mills said she had "no idea" her client had been house-hunting.