The Boys Are Back

updated 08/21/2006 AT 01:00 AM EDT

originally published 08/21/2006 AT 01:00 AM EDT

Except for the many millions in paychecks they're getting for Ocean's Thirteen, you'd never even know these guys were working. Since Brad Pitt, George Clooney, Matt Damon and pals reteamed in Las Vegas to film scenes for the third of their Rat Pack-style heist capers, "it's been like coming back from summer vacation and being with your friends," says a set source. "Just guys out there having fun." With help from one gal: Ellen Barkin (taking over from Julia Roberts and Catherine Zeta-Jones) will inject estrogen into the movie, due out next summer. Though Clooney and Barkin took in the Cirque du Soleil show Love together Aug. 6, after-hours Vegas carousing has been minimal. "They have a great time working together," says another source, "but they're on the set at 5:30 in the morning."

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