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HOW did Robert Pattinson and Kristen Stewart celebrate the box office success of their new movie, The Twilight Saga: New Moon?

With a slap up meal at Megu Japanese restaurant in Manhattan, New York, of course!

The rumored couple were spotted leaving the restaurant late Sunday evening.

The pair made separate exits to avoid being seen together.

New Moon — which also stars Taylor Lautner — had the third-biggest opening weekend in film history.

The flick grossed a whopping $140.7 million during its first weekend in theaters — earning $72.7 million on its Friday opening day alone, according to box office totals released Sunday.

On Friday night, Rob ditched Kristen to spend some time with the boys.

And as previously reported on Showbiz Spy, Robsten had a secret dinner with Rob’s parents when they were in Paris, France.

Robert’s aunt Diane Nutley said his parents Richard and Clare “got on like a house on fire” with Kristen.

“They had kept it secret because they didn’t know if they were together or not then,” she said. - showbizspy