There's romance ... and then there's bromance. Justin Moore and Thomas Rhett's relationship is the latter.

The two country singers are best buddies who share the same birthday (March 30) and the same label (Valory Music Co.) -- and any time you're looking for one, you'll probably find the other. Moore and Rhett seem to be as close as brothers: They swap hats (Moore is partial to a cowboy hat, while Rhett is all about baseball caps), hang out together backstage at awards shows, hit the greens for golfing during their downtime and even feel comfortable photobombing each other's pictures.

The two also have merged their musical careers, collaborating on Brantley Gilbert's "Small Town Throwdown" song and music video and touring together on Moore's Off the Beaten Path Tour. And just like any good friends, they also root for one another. Moore, who won New Artist of the Year at the 2014 ACM Awards, was vocal about who he wanted to see take home the trophy in 2015.

“I’ll tell you who I want to win: Thomas Rhett. We are really, really good friends,” Moore said. “I don’t really know the other guys. And I’m not saying they don’t deserve it. They do. But personally, I’m pulling for T.R.

“He’s in a different lane right now than most people, and he’s making that work,” Moore continues. “More importantly, he’s just a really good person, and I have a lot of respect for him.”

Even though there's six years between them, with Moore born in 1984 and Rhett born in 1990, the age gap doesn't affect their relationship in the least; in fact, it may come in handy: Moore can give Rhett advice on marriage and kids, while Rhett can make sure his buddy still gets out from time to time.

Click through the photo gallery above to see some of their most bromantic moments.

Thomas Rhett's Most Unforgettable Moments