New York, Apr 5 : A nanny has filed a lawsuit against Robert De Niro and his wife for not paying her more than 40,000 dollars in back pay after she worked overtime caring for their son.

In papers filed in Manhattan Supreme Court, Alexis Barry has said that she went to work for the `Meet the Parents' star and Grace Hightower in 2006.

The couple hired for a payment of 31.25 dollars an hour to care for their son Elliott, now 11, reports The New York Post.

She said that the celebrity couple also promised her to give 46.88 dollars for overtime.