What breakup rumors? has obtained more details of Angelina Jolie and Brad Pitt 's affectionate night out in L.A. Monday.

The casually dressed couple greeted pal George Clooney, who hosted a late-night afterparty for the premiere of his film Up in the Air at Beverly Hills restaurant Dolce Vita.

Arriving at 12:15, the pair were the last to join the small party of 30 that also included Cindy Crawford and husband Rande Gerber, the film's co-stars Vera Farmiga and Anna Kendrick. Clooney had two ladies on his arm: girlfriend Elisabetta Canalis and his mother, Nina.

"Brangelina seemed happy together," an attendee tells Us, nothing that they were "inseparable," and held hands frequently throughout the night. Not that they didn't mingle. Canalis complemented Jolie on her hair (which looks to be a new shade of brown in photos). Jolie, snacking on tomatoes, spoke with Farmiga about wearing fur and its brutality. Pitt, meanwhile, nursed a beer and asked other guests about their Thanksgivings. "He seemed genuinely interested in their response," the eyewitness says.

Another happy couple? Clooney and Canalis. The actor cheerfully introduced her to the crowd; "Elisabetta fit right in," the witness tells Us.

The Jolie-Pitts departed around 1:30 a.m. -- holding hands.

Ian Halperin's Brangelina: The Untold Story of Brad Pitt and Angelina Jolie paints a less rosy picture. "They've broken up so many times it would make your head spin," writes author Halperin, who declares that the couple will break up by "Christmas 2010."