Justin Theroux, the 42-year-old fiance of Jennifer Aniston is said to have met Mimi O'Donnell, the estranged partner of the star, and their children Cooper, 10, Tallulah, seven, and Willa, five, reported Us magazine.
"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," a source said.
Hoffman was found dead at an apartment in New York on February 2 of an apparent drugs overdose.
In 2005, Philip Seymour Hoffman turned out in support of the actor at the premiere of his movie 'The Baxter' and in 2010 Theroux appointed his friend team captain at LAByrinth Theater Company's annual Celebrity Charades benefit.