John Mayer is making himself at home in Jennifer Aniston's Hollywood Hills mansion, STAR reports.

John Mayer making himself at home in Jennifer Aniston's home

But Jen, 39, may be getting more than she bargained for. "He is constantly dusting and vacuuming, even when he's traveling from hotel to hotel," a source tells Star. And since moving in with the Marley & Me star, John has been tidying up after the cleaning lady! "John didn't care, he still thought the house looked dirty," adds the source.

Jen has started dressing more casually. And with his encouragement, she's trying her hand at poetry. "John," says the source, "is taking a lot of joy in shaping Jen into his fantasy woman."

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