Ben Affleck "couldn't be happier" now that he's finished his stint in rehab.

Ben Affleck

Ben Affleck

The 'Live By Night' actor - who has Violet, 11, Seraphina, eight and Samuel, five, with his estranged wife Jennifer Garner - revealed earlier this month he completed treatment for alcohol addiction, and now his close friend and fellow actor Matt Damon has said the star is happier than ever with his new outlook on life.

Matt told 'Entertainment Tonight': "He's with the kids now, couldn't be happier. Jen's working for a couple weeks in Atlanta, so he's Mr. Mom-ing it right now. And that's what he wants to be doing."

The news comes after the 'Batman vs. Superman: Dawn of Justice' star said in an honest Facebook post that he had undergone the treatment in order to be the "best father he can be".

He wrote: "I have completed treatment for alcohol addiction; something I've dealt with in the past and will continue to confront. I want to live life to the fullest and be the best father I can be.

"I want my kids to know there is no shame in getting help when you need it, and to be a source of strength for anyone out there who needs help but is afraid to take the first step."

And the 44-year-old actor went on to admit he felt "lucky" to have his family and friends as well as ex Jennifer.

He added: "I'm lucky to have the love of my family and friends, including my co-parent, Jen, who has supported me and cared for our kids as I've done the work I set out to do. This was the first of many steps being taken towards a positive recovery."

Meanwhile, it was recently claimed Ben and Jennifer, also 44, have put their divorce on hold to try and work out their differences and give their marriage another try.

A source said: "Jen has called off the divorce. She really wants to work things out with Ben. They are giving things another try."