Khloé Kardashian and French Montana's Flirty Date Night at Jennifer Lopez's Party—All the Details!

"What's going on between them is real. They're solid," a source tells E! News

From joint radio interviews to A-list parties, Khloé Kardashian and French Montana have definitely been making the rounds as a couple.

The pair was part of the blowout bash held last night for Jennifer Lopez's 45th birthday at Greek restaurant and lounge Nammos Estiatorio in Southampton, N.Y., and E! News learns these two lovebirds just couldn't get enough of each other. A source tells us the couple "were never too far from each other" while at the party.

"What's going on between them is real. They're solid," they tell us. The source also noted how tight Khloé was with the birthday girl, saying, "All night long, Khloé and Jennifer were pointing at each other and smiling. Who knew they were such good friends?"

Along with Kardashian and French, guests included Lopez's longtime manager Benny Medina, Scott Disick, Lopez's BFF Leah Remini, Fat Joe, Kelly Ripa and Mark Consuelos, Brian Atwood and Andy Cohen, a source tells E! News exclusively. "Jennifer was the last to get there, she came with her sisters," the insider dished. "She looked amazing in a white crop bustier underneath a white pantsuit. She was glowing."

Prior to celebrating the A-lister's special day, the twosome participated in their first joint interview on Power 105.1, where they candidly spoke about their romance, sex life and their joint business ventures.

"He is probably one of the funniest people I have ever met in my life," the E! star said of her beau. "In my life. You cannot stop laughing, like crying laughing. People definitely don't see the great parts about him too...but there's also a different side of him which he keeps more private as he should...He can be a softie sometimes."

She continued, "People are gonna comment no matter what. If I dated the most clean-cut perfect guy, they're gonna comment. That's just the way it is. If I'm having fun and if I like this kid, no one else should care, they're not f--king him," she laughed before adding, "Our maybe they are, I don't know."