Lady Gaga and Mayor Bloomberg share a New Year’s smooch in Times Square.Jackson Lee / Splash News

Pop Queen Lady Gaga, triggered the famous drop of the crystal ball and then danced with Mayor Bloomberg as the Crossroads of the World welcomed in the New Year as only it can.

Stars like Justin Beiber, Pitbull and Drake — along with the unseasonably warm weather — helped draw a throng of revelers which Bloomberg called a record.

“Largest crowd ever. It’s a great night. A couple of million people,” Mayor Bloomberg boasted to master of ceremonies Ryan Seacrest, though no specific number on the crowd count was released.

PHOTOS: NEW YEAR’S EVE IN TIMES SQUARE

Lady Gaga didn’t disappoint her “little monsters” as she strutted on the stage at 11:35 p.m. and sang “Heavy Metal Lover,” “Marry The Night,” and “Born This Way”

The pop princess appeared in a black-sequined number, a large sphere encasing her head.

But as the 11,875-pound Waterford crystal ball dropped, Bloomberg and Lady Gaga, who was raised on the Upper West Side, danced together to the tunes of Auld Lang Syne.

At least one of the 1,500 strong, newly minted NYPD uniformed cops got an unexpected lip-lock from co-host Jenny McCarthy during “Dick Clark’s New Year’s Rockin’ Eve With Ryan Seacrest 2012.”

David Quinn, 47, of Boise, Idaho, stood under the raining confetti.

“I’ve been out here since two, but it’s fine. I wouldn’t want to be anywhere else on New Year’s but Times Square.”

Ashley Charles, 26, of Parkchester, gushed, “I usually just party with friends on New Year’s. This is something everyone should do once, though. I’m happy to be here.”

Jeremy Caputo, 33, of Westchester, said, “Being penned in with a million people isn’t for everyone, but it’s better than sitting at home. It’s like being at a giant concert. And who wouldn’t want to be at a giant concert?”

Lizzie Stone, 31, of Birmingham, England, added, “The police told me I can’t come back if I leave to go to the bathroom.

Her husband, Al, 28, chimed in, “Go right here. Or find a bottle.”

Krystina Papesh, 19, and three friends traveled from Cleveland and picked out their prime spot at 5:45 a.m.

One of her friends, Savannah Polcen, 19, said they planned to hydrate as little as possible to get through the night without restroom breaks.

“We’re not drinking at all — no water, no nothing,” she said.