The actors separately paid visits to see Mimi O'Donnell, the estranged partner of the star - who was found dead at an apartment in New York yesterday (02.02.14) of an apparent drugs overdose - and their children Cooper, 10, Tallulah, seven, and Willa, five.
Justin was a very close friend of Philip and is said to be devastated by his death.
A source told UsMagazine.com: ''Justin is totally broken up about losing Phil. He's doing his best to provide some comfort to Mimi and the kids. He can't believe this happened.''
Although they didn't make a huge public show of their friendship, Philip had been there for Justin for many years. In 2005 he turned out in support of the actor at the premiere of his movie 'The Baxter' and in 2010 Justin appointed his friend team captain at LAByrinth Theater Company's annual Celebrity Charades benefit.
Meanwhile Australian actress Cate - who worked with Philip on 'The Talented Mr. Ripley' in 1999 - came to Mimi's house brandishing toys for the children.
Mimi had reportedly thrown Philip out of the family home late last year because of his heroin use and urged him to get sober.
A source told the New York Post newspaper: ''It was known that he was struggling to stay sober, and [Mimi] had given him some tough love and told him he needed some time away from the kids and to get straight again.''
The alarm was raised when Philip didn't turn up to collect his children on Sunday. He was found by a friend, David Bar Katz and his personal assistant, Isabella Wing-Davey.
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