'Bradley has been instrumental in nourishing Brad's new found love for sobriety,' a source told HollywoodLife.
Pitt also dished out some fatherly advice to his friend George.
Jolie filed for divorce from Pitt in September 2016.
The British actress has previously rubbished the romance rumours as 'predictable and silly'.
Earlier, Miller had rubbished the rumours calling them 'silly and predictable'.
Jolie has previously admitted that her family is going through a very difficult time.
Jolie filed for divorce from Pitt in September 2016.
Jolie filed for divorce from Pitt in September 2016.
Father's Day is on 18 June.
Pitt is currently involved in a divorce and custody battle with Angelina Jolie.
Ian Halperin dishes dirt on the couple's high profile marriage and their eventual split in his documentary.
Allied actor is putting 'in more time working on himself and his new healthy life'.
Joile will be turning 42 years old on 4 June.
Talking about Marcheline Bertrand, the actress said she sees her mother as an example of good parenting.
Maleficent star was linked to UK businessman after her split from ex Pitt.
War Machine actor recently admitted his alcohol problem was to blame for divorce proceedings.
Jolie and Voight were recently spotted leaving a sushi restaurant in Beverly Hills.
Formerly estranged, Voight and Jolie reunited in 2010 with Brad Pitt's encouragement.
Maddox has reportedly taking up the role of the 'man of the house'.
'It's just very, very jarring for the kids, to suddenly have their family ripped apart,' admits Pitt.
Fight Club star gave an insightful interview to GQ magazine.
The former Hollywood golden couple ended their 12-year relationship in September 2016.