Jennifer Garner, Ben Affleck Take Kids to Matt Damon's Pool Party

USMagazine, Monday, August 13, 2012, 12:30pm (PDT)

Little Samuel Affleck is already mingling with Hollywood's elite! 

Jennifer Garner, 40, and Ben Affleck, 39, took their three children, Violet, 6, Seraphina, 3, and Samuel, 7 months, to a pool party at Matt Damon's home in Pacific Palisades, Calif. August 11. Oscar winners Affleck and Damon, 41, have been friends since the early 1990s.

As Affleck looked after their girls, a braless Garner -- wearing a black tee and blue jeans -- carried her adorable baby boy.

Odd Life of Timothy Green actress Garner recently spoke with Extra about what it's like to have a baby boy in the family. "It's absolute chaos!" the actress admitted. "I really did not realize how much more work three was going to be than two."

PHOTOS: Jennifer Garner's life as a supermom

Garner also confirmed Us Weekly's previous report that Affleck was hoping to have one more child with his wife of seven years. "The fact that Ben wants another is true," she said. "[But] I am not anticipating having any more kids!"

Damon, meanwhile, has three children of his own with his wife, Luciana, 36: Isabella, 6, Gia, 3, and Stella, 1. The We Bought a Zoo actor also has a stepdaughter, Alexia Barroso, 13. The Damons met in Miami, Florida and were married in 2005.

PHOTOS: How Violet Affleck has grown up

"Like any father, I'm concerned a little about her [Alexia] becoming a teenager, because I know just what teenage boys are thinking," Damon said in an interview with the U.K.'s Radio Times in 2011. "Luckily, she is a terrific kid and the best you can hope for is that you are raising someone who has a lot of self-esteem and a lot of common sense."

PHOTOS: Jennifer Garner's maternity style

Unlike Affleck, Damon isn't looking to add to his brood. "With four I'm kind of hoping they pair off and leave us alone!" he told Jay Leno in 2011.

This article originally appeared on Usmagazine.com: Jennifer Garner, Ben Affleck Take Kids to Matt Damon's Pool Party