Summer has officially begun for Rascal Flatts. Earlier this month, the trio embarked on their 2014 Rewind Tour, and they're very excited to have special guest Sheryl Crow along for the ride.

"She's one of those artists that, she's already iconic," Joe Don Rooney tells The Boot. "She has so many more years of music to be made, and [we're thrilled] to have her on tour."

Crow has spent a few more years in the music industry than Rascal Flatts -- she released her debut album in 1993, while their first disc came out in 2000 -- but she just put out her first country album, 'Feels Like Home,' last year. Still, Rooney says they consider her "one of us."

"She's a Nashvillian now," he says. "She's always had that heart of country music."

And according to the guys, the songstress doesn't look a day over 18.

"You look at her, and it's like, 'My gosh, she looks like she just got out of high school,'" says Rooney.

Just as Crow continues to further her career and gain new fans, Gary LeVox, Jay DeMarcus and Rooney are hoping to do the same with their new album 'Rewind.'

“I felt like even more with this album we had something to prove and a big statement to make,” DeMarcus tells Taste Of Country. “We love people that say they’re influenced by us, but we’re still in the game to win it, not to be one of the old guys left sitting around.”

Prior to hitting the road, Rascal Flatts spent their spring helping out Outnumber Hunger, a collaboration between General Mills, Big Machine Label Group and Feeding America that supports local food banks.

They also recently stopped by our partner site Taste Of Country to record acoustic versions of some of their new songs as part of their Off The Record series. Check out 'Rewind' below: