Heath Ledger and Michelle Williams have split, Us Weekly can confirm.
A source close to the couple tells Us that Heath and Michelle "quietly and amicably split a few weeks ago."
"The relationship had been rocky recently. They tried very hard to make it work but finally decided to separate. They just grew apart."
The couple, who live in Brooklyn, NY and have a daughter, Mathilda, 23 months, met on the set of Brokeback Mountain.
"They have a beautiful daughter and they are both committed to being great parents."
Reps for the couple could not be reached.