Actress Sarah Jessica Parker?with her husband Matthew Broderick

Sarah Jessica Parker is reportedly set to split from her husband and is already house-hunting alone.

The 43-year-old actress - who has been dogged by rumours her 11-year marriage to Matthew Broderick is in trouble after claims he cheated on her with a 25-year-old woman - recently asked a New York broker to find her an apartment.

A source told America's Star magazine: "The time has come when she realises it just isn't worth it. Sarah Jessica is determined to get her own place and bring down the curtain on her marriage."

The "Sex and the City" actress and Matthew, 46 - who have a six-year-old son James Wilkie together - are already said to be living "separate lives".

Another source added: "Sarah's not stupid. She knows exactly what's going on. For a while it was easier for her to stay than go through a harsh divorce. They're essentially living separate lives."

Sarah and Matthew spent the festive period with each other for the sake of James, but it is believed the pressure of keeping up a happy pretence only caused further cracks in their relationship.

The source added: "They spent the holidays with him, pretending to be happy. Sarah is a great actress when she has to be!"

(China Daily/Agencies January 9, 2009)