By Breaking Celebrity News Staff

Photos of Casper Smart visiting an adult XXX peepshow the day before Jennifer Lopez's 43rd birthday may have come as a shocking, unexpected gift to the singer, but a regular at the 24-hour joint exclusively told Star magazine that he's seen Casper there in the past and it's a popular spot for gay men.

While many speculated Casper, 25, was just there to buy a sexy birthday gift for J.Lo, the backup dancer wasn't photographed leaving the establishment with any presents or packages, and was never seen entering the adjoining sex shop -- only the peepshow.

"This is a gay cruising spot," a man familiar with the spot told an undercover Star reporter who visited the New York City peepshow.

"You go into the booths, then you get all kind of tapping on the wall and propositions. It's like zombies."

Another peepshow regular told Star when shown a photo of Casper, "Yeah, I've seen him. He was in here about three weeks ago."

This isn't the first time gay allegations have been thrown Casper's way: As Breaking Celebrity News first reported, fellow backup dancer and Casper's Step Up 3D co-star Joshua Lee Ayers posted old photos of Casper on his Twitter account in which he was striking provocative poses with other shirtless men and Joshua urged viewers to check out his "low key homo ways."

However, J.Lo and Casper's rep, Mark Young, adamantly denie