Robert Pattinson makes new pals wherever he goes.

On Saturday night, the Twilight star, 26, hit the Van Cleef & Arpels Dinner for L.A. Dance Project, where he mingled with fellow A-list attendees, including a newly-blonde Natalie Portman and her choreographer hubby, Benjamin Millepied.

PHOTOS: Kristen cheats on Rob

Pattinson (smiling and holding onto a champagne flute) also posed with burlesque dancer Dita Von Teese, who stunned in a mauve, cleavage-baring Burberry dress and Van Cleef & Arpels jewels.

An eventgoer tells Us Weekly Pattinson was in good spirits throughout the evening.

"At one point he was laughing so hard, he almost spit out his beer!" the witness says of the Cosmopolis actor. "He seemed to be enjoying himself."

PHOTOS: Kristen and Rob's romance

One possible reason for his happy mood? Though they're keeping their reunion on the downlow for now, multiple sources tell Us Pattinson is ready to give his romance with Kristen Stewart -- who cheated on him in mid-July with her Snow White and the Huntsman director, Rupert Sanders -- another shot.

"They're working it out," one insider explained. "He's still in love with her."

This article originally appeared on PIC: Robert Pattinson, Dita Von Teese Party Together in L.A.