Nicole's guilt over kids

She has turned down roles for the sake of her children. Yet Nicole Kidman has admitted she feels guilty about the way they are being brought up.

The Oscar-winning actress adopted Conor, eight, and Isabella, 11, with ex-husband

Tom Cruise during their ten-year marriage.

The youngsters now divide their time between both parents' Los Angeles homes, and also spend time in Miss Kidman's native Australia.

'My kids come to the film sets and they give their opinion in terms of the different characters I play,' she said at the Toronto Film Festival.

' They have a complicated life, and it's something I feel guilty for.'

The 36-year- old actress was promoting her latest film, The Human Stain, alongside co-star Anthony Hopkins at the Canadian festival.

And she admitted that there are limits to what the children are allowed to observe. 'With Human Stain I wouldn't have them around during a sex scene,' she said.

She and Hopkins play lovers with a considerable age difference - something which Miss Kidman said should not be an issue.

'I've never been one to think that age matters,' she insisted.

'Be it a 70-year-old man and a 25-year-old woman or a 70-year-old woman and a 25-year-old man, they should be allowed to have a connection.

'There's a huge age difference in this relationship. In the film Anthony Hopkins says to me: "This is not my first love, or my great love, but my last love".

'I'm very proud to play complicated women in different kinds of relationships.'

Miss Kidman, wearing a white silk Chloe dress, attended the

premiere on Saturday with her agent, lawyer and managers while Hopkins was with his wife Stella Arroyave, whom he married in March.

Since her divorce from Cruise in 2001, Miss Kidman has not embarked on another relationship, although she has been linked to several men including Lenny Kravitz and Robbie Williams. The actress explained that, for now, her most significant relationship is with her children, and spoke about why she had turned down work because of them in the past.

One part, in the explicit sexual drama In the Cut, which Miss Kidman produced, went to Meg Ryan.

Explaining her decision to forgo the role, which was filmed just after her separation from Cruise, Miss Kidman said: 'I wasn't in an emotional state to be able to do that role at that time.

'I wanted to be with my children, and I'm very glad for Meg Ryan to be given such a complicated female to play and run with it.'

Whatever her worries, she must be doing something right, because one of her children - she won't say which - wants to follow in her footsteps and pursue an acting career, although she admits the other one 'couldn't think of anything worse'.

After the premiere Miss Kidman returned to New York where she is filming The Stepford Wives alongside Bette Midler.