Ashton Kutcher had a special lady by his side when he attended a party in L.A. Saturday.

The Jobs actor was accompanied by his new girlfriend — and former That '70s Show costar — Mila Kunis. The pair weren't shy about showing their affection for one another, sitting close together during the fete and sharing kisses in front of fellow partygoers.

Earlier this month, Kutcher, 34, and Kunis, 28, enjoyed an intimate meal at L.A.'s Soho House.

"They were seated on a couch on the same side of the table and Mila was running her hands through Ashton's hair," an eyewitness told Us Weekly. "She had her elbow resting on his back and couldn't stop playing with his hair and rubbing his shoulders. He leaned in and whispered to her and kissed her cheek."

This spring, the longtime pals decided to take their friendship to the next level, road-tripping together in April and going on dates around Los Angeles.

Despite their PDA-heavy outings, "They're not exclusive," a source said about the duo's determination to keep things casual — at least for now. "But they are hanging out and seeing where it's going."