JAY Z SAY'S B WANTS A BABY!

Her song "Single Ladies" is an Internet hit among dancing babies and now, Beyoncé's working on a tot of her own.
That's according to get this Jay-Z, B's notoriously tight-lipped hubby, who spilled the baby beans himself.

While chatting up Gotham mag editor in chief Cristina Greeven Cuomo, the rapper let it slip that procreating is high on the duo's priority list right now.

That's big news from hip hop's sneakiest couple, who wed secretly on a Tribeca rooftop and rarely even wear their own wedding rings in public.

It's also a change in attitude for Beyoncé, who admitted on "The View" in April that while she was interested in motherhood, she was in no hurry to hit the birthing room after seeing the process upclose when her sister Solange did it.

"I definitely want one, but I'm not ready for all of that," she said then. "I don't think a person should see that before her time. It was a little much. But I'm so in love with my nephew, and every time I see him I'm like, God, he's just amazing."

But the kid-friendly 28-year-old, who's made more than 40 Make-A-Wish Foundation fulfillments, is ready to summon her inner Sasha Fierce and go for it.

And all that, um, practice must be lighting a fire for the couple, married since April 2008. Backstage Thursday at the MTV Europe Music Awards in Berlin, where both got awards, the husky rapper held his beaming wife in a big bear hug, When she got up to the podium, Beyoncé (photo l.) said, "There is only one person I want to thank, and that is Jay for putting a ring on it." And did she ever thank him with a big red lipstick smack on the neck for all to see as the two left a nearby nightclub in the wee morning hours.

All this action must be doing wonders for Brooklyn-born Jay-Z's already healthy self-esteem.

"I don't dislike anything about myself," he told Gotham. "I know this sounds a little arrogant, but I really accept what God has given me. I've got a short temper, but I work on controlling it. I can say inappropriate things because I believe them to be true and sometimes that can be hurtful to others. But I think in the long run it is more helpful."

And while Beyoncé is more than happy to collaborate with her man, even Jay gets rejected sometimes when it comes to musical partnerships.

"[Two-man band] MGMT turned me down," he admits.