Matt Damon Speaks Out On Ben Affleck After Rehab 

WATCH Ben Affleck confirms \'treatment for alcohol addiction\'

Matt Damon says his best friend, Ben Affleck, is doing "fantastic" following his stint in rehab for alcohol addiction.

During an appearance at CinemaCon in Las Vegas to promote his new film, "Suburbicon," on Tuesday, Damon told "Entertainment Tonight" that Affleck is "with the kids now" and "couldn\'t be happier."

Read: Ben Affleck says he has \'completed treatment for alcohol addiction\'

Related: \'Wonder Woman\' wows, Affleck makes appearance at CinemaCon

Matt says Ben is "Mr. Mom-ing it right now," while his estranged wife, Jennifer Garner, is in Atlanta filming her upcoming movie, "Simon vs. the Homo Sapiens Agenda."

Affleck is "lucky" to be surrounded by such a solid group of guys, according to Damon. "I have a good group of friends ... we always keep track of each other and look out for each other."

Earlier this month, Affleck, 44, announced that he successfully completed a rehab program.

"I want to live life to the fullest and be the best father I can be," he said in a Facebook post earlier this month. "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."

"Suburicon," co-written and directed by another Damon pal, George Clooney, and co-starring Josh Brolin and Julianne Moore, opens nationwide in November.

\'The Boss Baby\' and \'Ghost in the Shell\' among this week\'s new releases

Hayden Christensen, Mark Hamill back for \'Star Wars\' Celebration

Assault charge dropped against Shia LaBeouf

Alex Rodriguez confirms he\'s dating Jennifer Lopez

Russell Brand still has \'warm\' feelings toward ex Katy Perry

\'Game of Thrones\' star Finn Jones on his new \'Iron Fist\' family

Alec Baldwin opens up about past substance abuse

Jewel used self-taught meditation to help cope with anxiety

Maksim Chmerkovskiy speaks out about calf injury

White House officials played role in surfacing documents Nunes viewed

White House allowing public to request financials for senior staff

Most occupants in Texas bus crash were wearing seat belt: NTSB

Girl with rare, severe face cancer sparks emotion in \'hope\' photo campaign

Man buys 40 Powerades for 5th graders stranded on interstate from broken-down bus

April the giraffe \'has progressed significantly,\' park owner says

7-year-old basketball star gets a special surprise from Harlem Globetrotters

93-year-old WWII vet prepares for upcoming birthday piano recital

Teacher raises $80K for bikes for elementary school\'s entire student body

School crossing guard, 91, marks 50 years of service

This Amazonian frog\'s poison is part of latest supercleanse trend

Girl gets one-eyed bunny doll named Sparkle after losing her eye to cancer

Fire survivor teaches children fire-safety tools that saved his family

Millennials, hoping to find real connections, ban the booze