After months of keeping they nasty on the down low, Michelle Williams and Spike Jonze are finally giving each other the public rub down and suck down.

After attending a Cinema Society screening of Synecdoche Wednesday night, the couple walked out with Jonze caressing Williams' back and wrapping his arm around her waist.

The pair held hands as they walked through the lobby. Jonze snaked his arm around Williams' waist again. "He couldn't seem to keep his hands off her," said an onlooker. "It was very cute."

While the two talked with friends, they stood so close they were "practically spooning," said one fellow guest.

And later, when they decided to leave the bash at around 1 a.m., Williams and Jonze shared a mini makeout session â€" on their way to the elevator.

Don't they look like such an adorable couple! Michelle met him in '06 when she auditioned for his film, Where the Wild Things Are. Then the two reconnected, literally, last year when she signed on to star in Synecdoche, which he produced.