(Cover) - EN Showbiz - Robert Pattinson and Kristen Stewart were inseparable at the premiere for his new movie and were spotted passionately kissing as they left an after-party.

The pair have been dating on and off since they met on the set of the first Twilight movie. Despite speculation they had recently broken up, Kristen showed her support for the British hunk by attending the Water for Elephants premiere in New York City on Sunday night. While Robert graced the red carpet in a tuxedo and spoke to his hordes of fans, 21-year-old Kristen avoided the spotlight and arrived through a back door.

After the movie, the happy couple attended the premieres after-party at Le Cirque restaurant and partied until the early hours.

They were inseparable all night as they enjoyed beers, hung out with Rob's family and left the party together hand in hand around 1am, reports E! Online.

As Robert and Kristen left the venue and got into a car, they were spotted engaging in a passionate kiss.

They are then believed to have returned to the Mandarin Oriental hotel where they spent the night in a lavish suite. The stars enjoyed a leisurely morning where they ordered room service.

They ordered blueberry muffins and orange juice, a source told the American edition of OK! magazine.

Earlier in the evening, Robert revealed he was exhausted as he had been shooting the final scenes for the latest Twilight movie in Vancouver. The 24-year-old then took a red eye flight from Canada to New York to attend the premiere for Water for Elephants. (C) Cover Media