Is Lance Bass Sweatin' It With a Personal Trainer?

Has Lance Bass found himself a new hunky boyfriend?

Three's not a crowd for Lance Bass.

The former boy-band crooner was hanging out with one of his exes, hairstylist Ben Thigpen, on Friday night at New York City hot spot Tenjune.

And there was someone else with them.

A source reports that Bass' new beau was also there.

There aren't a lot of details about the latest guy, but a source says his name is Sebastian, and he's believed to be a personal trainer.

The three boys stayed put in the club's VIP area and "closed the place down," the source said.

Another source said this new guy has been in the picture for some time now, but he and Bass have kept things "casual."

Lance's rep could not be immediately reached for comment.