The couple first went public when they stepped out together last fall, just a few months after Lopez had separated from Marc Anthony, her husband of seven years, reported Us magazine.
"I don't think it was love at first sight for either of us. It was just very natural how it happened. There was nothing before, no flirting, nothing," Smart said.
The dancer is currently working as the chief choreographer on Lopez's world tour with Enrique Iglesias.
On how has it been working so closely with his girlfriend, Smart said, "Sometimes I tell her something, give her notes. But at the end of the day, you know, it doesn't matter what position is what, because she's the boss, you know?," he said.
R&B star Rihanna and rapper Drake are leading the MTV Video Music Awards (VMA) nominations with five nods each.