HOT PIX! - Brad, Angelina, And The Boys Hit The Beach!

Brad Pitt, Angelina Jolie and the kids enjoyed Malibu beach on Saturday, over the Memorial Day weekend.

The family visited friends in the upscale Malibu Colony neighborhood and while Pax and Maddox played on the beach, mom and dad sipped wine and relaxed on the home's expansive deck.

Our photographer on the scene tells us: "Brad and Angelina were enjoying themselves at this party, but they wouldn't really let loose. Angelina was sitting by herself, reading a magazine -- obviously not wanted to really talk to the other guests at the party -- and Brad was mingling but he looked constantly concerned that Angelina wasn't having fun. You could tell if she hadn't been there, he would have had a better time."

Lighten up, Ang! Meanwhile, Maddox and Pax had a great time tearing it up in the waves. These two know how to party!

Check out the gallery below -- it's a good one!