Sienna Miller has been living with her married lover Balthazar Getty for the past month, according to a new report.

The actress is rumoured to have been dating the wealthy father-of-four since her split from Welsh actor Rhys Ifans last month – rumours which seemed to be confirmed when the pair were snapped sucking faces on a boat off Italy's Amalfi Coast.

Now it's being claimed that Miller moved in to Getty's Los Angeles home four weeks ago - begging the question: was there some overlap between Rhys and Miller's new man?

Friends of Miller insist the actress has not come between Getty and his wife, and claim his marriage was over before he even met Miller.

A source tells the New York Daily News, "Sienna didn't break up his marriage.

"It's been in trouble for a year. The truth is, they've quietly separated."

Getty is married to Rosetta Millington and the couple has four children.