Law issued a statement after reports of his affair with Ms Wright, 26, who cared for one of his three children.

"I just want to say I am deeply ashamed and upset that I've hurt Sienna and the people most close to us," said Law, 32.

"There is no defence for my actions which I sincerely regret." He and actress Miller became engaged in 2004.

'Unreasonable behaviour'

Friends said Law and Miller were "working through" their problems following Law's admission.

Law, who starred in Alfie and Sky Captain and the World of Tomorrow, was filming in New Orleans when the affair with Ms Wright began, it has been reported.

Ms Wright was employed to look after one of Law's children with his ex-wife Sadie Frost as he filmed his new picture, All The King's Men, earlier this year.

Frost, 38, and Law, 32, married in 1997 and have three children together. Frost was granted a divorce from Law in October 2003 citing "unreasonable behaviour" on his part.

Law first met Miller on the set of the remake of Alfie and they became engaged at Christmas.

source: bbc