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Casper Smart, Jennifer Lopez, Billboard Music Awards

Frazer Harrison/Getty Images

Jennifer Lopez and Casper Smart are officially back on—and she's not holding it in any longer!

The American Idol star posted an Instagram shot of her on-again love in honor of Man Crush Monday and wrote, "#MCM @beaucaspersmart #lovethispic #handsomebear."

And while the two have been keeping quiet about their relationship status, and dodging rumors that they're back together, E! News has exclusively learned that Lopez and Smart are most definitely a couple.

Early last month, the loved-up duo took a low-key vacation to Mexico with J.Lo's twins, prompting many to believe that they were more than just friends.

But at the time, E! News caught up with Lopez during a taping of the hit Fox reality show and she told us, "I am single right now; thank you."

The 28-year-old professional choreographer also kept the cards close to his chest when asked about his love life.

While he attended the premiere of her movie Home back in March, he insisted that he and the brunette beauty were on completely platonic terms.

"We got a lot of ties. We're very close," he admitted to us when asked about spending time with his ex. "We're friends. We're very good friends."

The two landed in the headlines once again, in late March, when they were seen kissing on the set of American Idol.

Lopez and Smart dated for a little under four years before splitting in June of last year.

But despite the split, Jenny from the Block made no secret of the fact that she's the ultimate hopeless romantic.

"I'm one of those people who does not like to be alone," she said at Idol's Winter TCA panel last year. "I have no shame saying that at this point in my life. I think we have to own who we are… My parents were married for a very long time, for 35 years. I believe in it. It's difficult. I've had my challenges but at the same time I believe in love. That's the main thing."