Rob Pattinson and Kristen Stewart got away for some private time while the rest of the New Moon cast partied following the New York screening of the movie—and the two stars were we acting very much like a couple!

Usmagazine.com reports that the couple left their co-stars behind to celebrate while they went to Avenue, around 1:30 a.m. and took a table on the mezzanine — keeping a security guard close by.  According to USmagazine.com:

Among the small group joining the couple at Avenue was rocker Joan Jett (who Stewart portrays in the film The Runaways). Pattinson — who is also a musician — was particularly fond of Avenue’s rock-heavy playlist. “Robert kind of sang along to the words in the songs he knew,” including “Common People” by Pulp, an observer tells Us.

Adds another eyewitness of Pattinson and Stewart: “They sat very close to each other [and] looked very happy together. They chatted together the entire time.” Their drinks of choice? Amstel Light for him, Belvedere Vodka for her.  When the pair left around 3am, “they were holding hands,” an eyewitness says.

On Wednesday, Kristen and Rob joined New Moon cast mates for dinner and an eyewitness told UsMagazine that Pattinson and Stewart were “giggling a lot, and sitting very close” and acting like two people in love.

Despite reviews, the Twilight sequel has already set box office history, breaking all records with an estimated $26.3 million from just the midnight showings of the movie.