While walking the blue carpet Sunday at Sony’s “The Smurfs” 3D premiere at the Ziegfeld Theater, star Hank Azaria answered a key question: “I have worked blue before, let’s just put it that way.”

Co-star Neil Patrick Harris laughed, “I’m hoping that this is the only blue movie anyone knows I’ve made.”

As to the afternoon’s other question, George Lopez confessed, “I’m really not sure what a Smurf is. I’m happy to be just be one. I’m the voice of Grouchy Smurf — even though I’m not sure what I am.”

Ditto Jeff Foxworthy who voiced another Smurf, “I have no idea. They’re close to the ground and they’re blue.”

But “Glee’s” Jayma Mays gave the right answer, “A Smurf is a little blue creature that is three apples high according to legend. They all have very unique identities and they’re all about families and togetherness and they’re wonderful.”

Added director Raja Gonsell, “A Smurf is a humanic character three apples high who lives in the forest in Belgium and they live in mushrooms. We’re not really sure where they come from, but when there is a new Smurf they come with a stork.”