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Lady Gaga was photographed making out with her on-again beau Luc Carl in a swimming pool at the St. Regis Hotel in Houston.

Carl and Gaga, 24, split a few years ago but started dating again a few weeks ago.

She recently told Rolling Stone she wouldn't have been as "successful" if Carl, a musician and bartender, hadn't broken her heart. See more pics of the couple making out!

"I've really never loved anyone like I loved him. Or like I love him," she said. "That relationship really shaped me ... I sort of resolved that if you can't have the guy of your dreams, there are other ways to give love."

Word has it, she even penned the tune, "You and I," about him.

Sample lyrics: "It's been a long time but I'm back in town/But this time I'm not leaving without you."