Sienna Miller's Balthazar beg

Aug 11, 2008, 4:00 GMT

06/18/2008 - Sienna Miller - 62nd Annual Edinburgh International Film Festival - "The Edge of Love" Premiere - Arrivals - Cineworld, Fountain Park - Edinburgh, Scotland © Solarpix / PR Photos

Sienna Miller has begged her married lover to help save her Hollywood career.

The 'Edge of Love' actress is said to be terrified film bosses will avoid working with her because she has been branded a 'homewrecker' since she started dating 'Brothers and Sisters' star Balthazar Getty.

Sienna, 26, has now reportedly asked Balthazar, 33, to attempt to convince his estranged wife Rosetta to release a statement confirming their marriage was over before he started dating the 'Factory Girl' actress.

A source told Britain's News of the World newspaper: "Sienna is being portrayed as a femme fatale and fears for her career because Hollywood hates a homewrecker.

"She hopes Balthazar can get Rosetta to put out a statement saying their marriage was already over. They have already got friends to speak out, saying he was sleeping on their sofas."

However, Rosetta, 38, is allegedly refusing to help because she is so angry about the way she has been treated.

The source added: "It's nonsense that the marriage was already over. When Balthazar went away in May, Rosetta thought it was to see his sick mum in Germany. But she now knows that it was to cavort with Sienna in Prague."

News of Sienna's relationship with Balthazar broke earlier this year, and last month the couple were photographed frolicking on a yacht and a beach while on holiday in Italy.

Last week, friends of the couple blasted rumours Balthazar had started dating Sienna while he was still happily married.

One pal said: "Sienna and Balthazar met through friends and he was already separated from his wife. When he released a statement in July saying he had split from his wife Rosetta, he had been sleeping on friends' couches for six months."