Sadie 'so sorry' for Sienna

Some women in her shoes might be feeling rather smug.

Instead, Jude Law's ex-wife Sadie Frost has said she feels desperately sorry for his fiancee Sienna Miller after it emerged the actor had been unfaithful

Miss Frost, whose divorce from Law was finalised a few weeks ago, spoke for the first time since the 32-year-old's admission that he had cheated on Miss Miller with Daisy Wright, the nanny of his three children.

Law's seven-month engagement to Miss Miller, 23, is under huge strain after Miss Wright sold the story of their affair - which took place while he was filming in New Orleans in March - to a Sunday newspaper.

'I didn't see this one coming. It was a total shock to everyone,' Miss Frost said at a party she was attending in London with her new boyfriend, musician Jackson Scott. 'I just want to say publicly that I feel for her. I feel very sorry for her. I think she is young and has a great career ahead of her - but I do feel very sorry for her.'

Miss Frost hinted that she could see certain similarities between the situation and her own six-year marriage to Law.

'This is not my crisis, thank God. My life has moved on - I have my kids and my own life to live,' she said.

Miss Frost and Law finally agreed a divorce settlement earlier this month, although they split nearly two years ago.

But the 38-year-old stressed she was only a phone call away if Miss Miller felt the need to talk.

'I have all sorts of advice for her but I do not want to go into that publicly,' she added.

'If she phones me I'll have a long chat with her. I can only give her advice if she asks for it really. Otherwise, I have to stay out of it. This is something that they really have to sort out together.'

Referring to Miss Miller's decision to pull out of a performance of Shakespeare's As You Like It in the West End, Miss Frost said: 'I think it's really sad now that she has felt unable to go on stage because of all this.

'I feel very sorry that she is so hurt she had to walk out. I will talk to her if she calls me. I'll have to consider what I say. My heart goes out to her, I really feel for her.'

Miss Frost was speaking at the Berkeley Square Ball in aid of the Prince's Trust charity. She was joined by Mr Scott and her friend, actress Samantha Morton.