The 45-year-old actress - who plays glamorous writer Carrie Bradshaw in the `Sex and the City` movies and TV series - says motherhood has left her so exhausted she has no time to spend on her appearance.
She said: "I don`t have a beauty secret. I feel old and tired! I have children I run round after, I try to walk as much as possible, and other than that I buy every cream possible.
"I love beautiful clothes and am privileged enough to have access to a lot of them, but they`re returned the next day. They`re not mine!"
SarahJessica raises three children, son James Wilkie, seven, and 10-month-old twin daughters, Marion and Tabitha, from a surrogate, with her actor husband Matthew Broderick.
Despite being left drained by her hectic lifestyle, SarahJessica loves being a mother.
She said in an interview with heat magazine: "Having my boy and now the twins, life is delightful. When I used to come to London, my first stop was Harvey Nichols, but now it`s all about Hamleys toy shop. That store is amazing!
"The girls couldn`t be more different. One is constantly looking around and reaching out, the other is very serious and slightly aloof."
SarahJessica has portrayed her fashionable alter-ego since 1998, and although she adores Carrie, the actress doesn-t believe they are anything alike.
She said: "I don`t feel like Carrie - my life is so different, my choices are different. But I love her. I love playing her and everything about her - the good, the flawed, the mistakes, the bad choices.
"I understand that people will blur the lines, but I feel very different. Which is probably why it works so well, because if she felt familiar to me, I would have bored of playing her a long time ago."