December 09, 2011 01:00 PM

Matt Stamas/Getty

With sister Candice expecting a baby boy with husband Tony Romo come April, Chace Crawford says he can’t wait to tackle his new role.

“I’m over the moon!” the Gossip Girl star, 26, tells PEOPLE Tuesday at a photo exhibit by Mick Rock at W New York Downtown.

“I’m going to be the best kind of uncle — the kind that gets to take him to baseball games and feed him cotton candy.”

And although he’s setting himself up to be the cool uncle, Crawford admits certain things will be off limits.

“When he has to get changed, I’ll take him to Candice. And then I’ll be back when it’s time for video games and spoiling him,” he jokes.

“Tony and I are very close. He’s the best of the best,” Crawford says of his brother-in-law, a quarterback for the Dallas Cowboys whom his sister, 24, wed in May.

Will the actor be settling down like Candice? “I’m not in a relationship right now. I like to hang out. I like to go on dates,” he explains.

So does that mean he’s single? “I’m not saying one way or the other!”

— Carlos Greer

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