McCauley Culkin’s baby brother, Kieran Culkin, is all gown up and hookin’ up on set with Paper Man co-star Emma Stone. Kieran and Emma have been getting cozy nearly every night at the Backyard Bar in Montauk where they are location filming.

The insider adds, “They seem to get along well and have spent time there, just the two of them… closing down the bar in the wee hours of the morning.”

Here’s hoping that that this Culkin is better looking in real life than in print…yikes. Those poor Culkin kids grow out of their cutest way too fast.