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The cast and crew of "Eclipse" took over Vancouver sushi restaurant Miku over the weekend to celebrate filming of the third "Twilight" installment, and all eyes were on co-stars Robert Pattinson and Kristen Stewart.

The two were very close during dinner, taking smoke breaks together and even leaving together.

On Saturday, they snuggled at a Kings of Leon concert -- when they weren't laughing and smoking cigarettes.

"They've decided to be more public about going out now," an insider tells new issue of Us Weekly (on newsstands now). "They're not boyfriend and girlfriend, but they've definitely hooked up."

Their "Twilight" co-stars are supportive.

"If they want to date each other, fine!" Billy Burke, who plays Stewart's dad, tells Us. "Look, when you're that age, you're going to make mistakes. You're going to date people you probably shouldn't date. It's all part of the growing process."

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