The 'Sex and City' actress thinks it is incredible that Angelina has opened her home to three underprivileged children - Cambodian son Maddox, six, three-year-old Vietnamese son Pax and two-year-old Ethiopian daughter Zahara - and admits she can't even imagine doing the same.

Sarah - who has a five-year-old son, James, with husband Matthew Broderick - said: "It's too late for me to have a big family - I can't imagine it now.

But I do think that what people like Angelina Jolie do is amazing. I love being a mother and I would be thrilled if my family were larger but I can't imagine having eight children."

The 42-year-old star admits she finds it hard to balance motherhood with being an actress because of all the attention it brings.

She added to Britain's OK! magazine: "The loss of privacy scares me, that's why you don't hear me complaining about that stuff and that is why you can't trap me into talking about the paparazzi.

"I don't know if I have found a happy balance with the cultural phenomenon of celebrity, especially what has happened over the last five years. I don't think I will ever understand or strike a balance with that."