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Chalk it up to the honeymoon phase?

Newlyweds LeAnn Rimes and Eddie Cibrian are packing on the PDA everywhere they go!

A source tells Us Weekly that Rimes, 28, and husband Cibrian, 37, attended an NBC upfront party at Del Posto in NYC on Monday night and were "making out in the middle of [everything]." The source adds Rimes was "making a compete scene and holding up her camera as they are making out so she [could] take pictures of them making out -- it was unreal."

"We were like, 'Who the hell is that?'" the source says. "And of course it was them. It was so beyond ridiculous."

PHOTOS: Stars caught cheating!

Another source on the set of Cibrian's new show The Playboy Club tells Us: "LeAnn never left [Eddie's] side when they shot the pilot."