Emma Stone and Kieran Culkin are dating! That explains why Emma couldn’t stop smiling as she arrived at the Ed Sullivan Theatre in New York City for a David Letterman visit late last night.

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Star magazine reports that Emma, 21 and Kieran Culkin, 28 were spotted kissing and cuddling openly while strolling in NYC earlier this month. Who’s Kieran Culkin? He’s the brother of Macaulay Culkin, who’s best known for his role in Home Alone; and he’s the lucky beau of gorgeous Mila Kunis.  Kieran’s the Paper Man star.

The two have kept their romance tightly under wraps since they sparked while shooting the dramedy Paper Man in 2008. But Emma, 21, and Kieran, 28, were spotted openly kissing and cuddling while strolling in NYC on Oct. 2.

A source says, “They were very lovey-dovey with each other,” “When they weren’t kissing, he was making her giggle!”

Emma was on David Letterman last night, she talked about Paul McCartney making her veggie burgies and getting tattoos. She’s getting a tattoo for the first time with her mother tonight. How cute!

photos: Fame

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