She may have been solo as she walked the red carpet at the premiere of "On the Road" last night, but Kristen Stewart was anything but alone at the film's after party.

Stewart, 22, was not only joined by her fellow cast members, but the actress was spotted cozying up to her on-again beau, Robert Pattinson, 26, who attended the Nov. 3 bash. The "Twilight" co-stars eyed each other all night as they mingled with friends and sipped on cocktails.

According to E! News, the couple hung out on the Garden Terrace at the Audi-sponsored event, which was held at the Roosevelt Hotel across the street from Grauman's Chinese Theater in Los Angeles, Calif., where the screening took place. And although they didn't pack on the PDA, Stewart and Pattinson shared plenty of sweet moments before leaving together at around 1 a.m.

As Stewart chatted with her co-star Amy Adams, Pattinson talked with a male pal while puffing away on an electronic cigarette.

E! News reports:

A bit after midnight, Kristen was dancing and Rob made his way back to her. They spoke energetically and were playful, with Rob jokingly showing some dance moves of his own. As for PDA, she patted his chest a few times as they talked and rubbed his head at one point. He whispered in her ear and put his arm around her for a moment. Just before 1 a.m, Rob looked like he tried to rally some people to leave and a few minutes later Kristen followed after him.

Stewart rocked a Balenciaga bra-top on the red carpet before changing into a leather bomber and black tank top as Pattinson sported a black jacket and jeans. The pair are gearing up to promote "Breaking Dawn - Part 2" this week.

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