Caught in the Act

Brad Pitt Celebrates 48th Birthday in Vegas

12/18/2011 at 02:00 PM EST

Brad Pitt's birthday weekend was quite a "thriller"!

The Moneyball star, who turns 48 on Sunday, was joined by longtime love Angelina Jolie and their six children in Las Vegas Saturday night to experience the Michael Jackson The Immortal, the Cirque Du Soleil touring show.

"They had great seats, sitting right beside the stage," a source said. "They really seemed to enjoy the show. The performers didn't know they were there and a few of them recognized them while they were on stage, so it was pretty exciting."

After giving a standing ovation, Pitt, donning round glasses, Jolie, wearing a light grey dress, and the children left just as the cast gave final bows. The family spent the night at the lavish Four Seasons.
– Mark Gray