Actor Kate Winslet and husband director Sam Mendes are shown Feb. 24, 2009. They announced Monday that they have separated. (Evan Agostini/Associated Press)

Oscar winners Kate Winslet and Sam Mendes have announced they are splitting after six years of marriage.

Winslet, 34, star of Titanic and Oscar-winner for The Reader, and the director of American Beauty and Away We Go separated earlier this year, according to a statement from Britain's Shillings law firm.

They plan to work out joint parenting for their six-year-old son, Joe Alfie, and Winslet's daughter by a previous marriage, Mia Honey, Shillings said.

Winslet starred in and Mendes directed the 2008 film Revolutionary Road about a troubled marriage.

Winslet won a Golden Globe for best dramatic actress in the film, and in her acceptance speech she thanked her husband for pushing her so hard.

Winslet was previously married to Jim Threapleton, whom she met on the set of the film Hideous Kinky and with whom she had Mia Honey. They divorced after three years.

In 2001, she met Mendes, who approached her about appearing in a play at the Donmar Warehouse theatre in London.

The couple, who are both from Britain, married in a low-key private ceremony in 2003 on the island of Anguilla in the Caribbean.

They say their separation is "entirely amicable and is by mutual agreement."

With files from The Associated Press