Sienna Miller's Friends: 'She's no Home Wrecker'

Sienna Miller's friends have jumped to the actress' defense, insisting she's no home wrecker.

Those close to the star -- whose reputation has been left in tatters following her affair with married oil heir Balthazar Getty -- say Siennna would never have gone near Getty if he was still with his wife, Rosetta.

"She and Balthazar met through friends and he was already separated from his wife," one close associate told the New York Post, adding that when Getty announced in July that he'd split up with Rosetta, the mother of his four children, "he'd been sleeping on friends' couches for six months."

Sienna -- who has been branded 'Sluttyenna' by many bloggers due the long list of famous men she has dated (she recently split from Rhys Ifans) -- caused a media firestorm last month when photos surfaced of herself and Getty in various stages of undress on vacation in Portofino, Italy. At the time, Rosetta was said to be "heartbroken" and Miller -- who once dated Jude Law while he was still married to Sadie Frost -- was branded a serial home wrecker.

The source added, "Please. Sienna and he are in love. They're living together in LA. Everyone knows about her and accepts her."

And blasting rumors Getty's family disapproves of Miller, the pal says, "The photos of Sienna and Balthazar on the boat in Italy?

"His mother and her mother were the ones sitting next to them. Balthazar is in LA with her now and he's speaking to Rosetta and going to [his old address] to see his children. Sienna has been hanging out with his family all week.

"It's just annoying that all this misinformation is out there. He should've announced his separation a lot earlier than he did - she was always told he was separated. There's no way she would ever get involved with another married man after Jude Law."