Florida Georgia Line soared to superstardom when rapper Nelly collaborated with them on their chart-topping tune, 'Cruise,' from their debut album, 'Here's to the Good Times.'

Now, as the duo, made up of Tyler Hubbard and Brian Kelley, work on their sophomore album, rumors are swirling that the guys are teaming up with another rapper -- specifically Wiz Khalifa -- but the guys admit that they are still unsure themselves.

"If I'm 100 percent honest, we actually don't even know for sure, to be honest," Kelley reveals to Country 92-5. "I know that sounds crazy, but we're actually not sure. It's hard to tie him down ... it's definitely not a definite."

What the men can reveal are details for their new project, which they are currently in the studio recording.

”We’ve been in there for a couple months now, just really taking our time and chipping away at it, and trying to learn more,” Kelley says. “We're trying to step our game up. We’ve got a couple of awesome songs that we’re pumped about everybody hearing. Can't wait to get the new stuff out. It's definitely gonna have evolved from record one, but it's still going to have that FGL feel, but we're going to take some chances here and there."

Florida Georgia Line are continuing their run as the opening act on Jason Aldean's Burn It Down Tour this weekend, and will also kick off their own headlining This Is How We Roll summer tour on May 29 in Bossier City, La., with Nelly serving as the opening act. See a list of all of their upcoming shows here.