Underwood's most recent rumored fling was NFL player Tony Romo, and Crawford is too new on the scene to have been rumored with anyone.
The pair stopped by Manhattan's Marquee nightclub last Friday, then popped into Gramercy Park Hotel's hip Rose Bar on Saturday night.
"At one point, they were holding hands, off to the side of the table, like they didn't want people to see," says an observer.
In a previous interview with People, Carrie said about Chace: "He's really cute," I've met him and he seems like a really nice guy. He's got cool hair, he's a nice height and he just has beautiful blue eyes."
Everyone say: "Aw-w-w-w-w...."