At gourmet Japanese restaurant Miku on Friday, Kellan Lutz couldn't stop popping sushi into his mouth, Robert Pattinson and Kristen Stewart were inseparable and Taylor Lautner had no problem being their third wheel.
"Rob and Kristen were close all evening," a source told PEOPLE of the cozy costars. "She was at Rob's side throughout the whole party. When Rob went out, Kristen went out."
Other inseparable costars were Cullen coven cuties Nikki Reed, Ashley Greene and Elizabeth Reaser, who "wore smiles all night." Eclipse director David Slade, Jackson Rathbone and newcomers Xavier Samuels and Bryce Dallas Howard (who's replacing Rachelle Lefevre as vengeful vamp Victoria) were also in attendance.
The party ended around midnight, with Pattinson, Stewart and Lautner sharing a cab to their hotel together. "They were a wonderful group of people, full of fun," the source added.
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The stars then headed to Water Street Cafe in Gas Town before hitting the Kings of Leon Concert. The Chambar Restaurant – where sources say the cast stayed until 4 a.m. – was the after-concert hot spot.
The next day, Reed and Reaser were spotted at Tropika Maylasian restaurant on Robson Street. Reed continued the weekend of bonding with Greene, Lutz, Samuels and a few other friends, checking out Kings of Leon again and catching eyes of fellow concertgoers as they danced near the stage.
Monday morning brought an early start as they began shooting the third film, Eclipse.
VIDEO: Check out the New Moon crew on the town in Vancouver