Pitt reportedly made a brief appearance at a cast and crew party that evening, but quietly slipped away before 10 p.m., returning to his room to spend time with Jolie. "Brad is very discreet," a source told PEOPLE. "But he wanted to make an appearance so the crew would know he was there."
The pair's reunion was short-lived, however, as Jolie left the next morning. Pitt remained in his suite, preparing for the shoot that began on Monday.
"He was nice, but very serious," a source at Pitt's hotel said. "You can tell he is here to work."
For more on Brad and Angelina's rendezvous, pick up the latest issue of PEOPLE, on newsstands Friday.