Florida Georgia Line and their pal Nelly helped close out Season 4 of 'The Voice' on Tuesday (June 18) by performing the remix version of the country duo's monster smash 'Cruise.'

Season 4 was heavy on country music, with coach Blake Shelton's team loaded up with like-minded contestants from the genre. But it's always fun to welcome a chart-topping country act that has nothing to do with Shelton to the stage.

'Cruise' is one of the ultimate summer anthems, as noted by show host Carson Daly, and Brian Kelley and Tyler Hubbard certainly showed America how country music is done with an assist from their St. Louis rapper pal.

The camera panned to the coaches during the performance and R&B crooner Usher was feelin' it, wearing an ear-to-ear grin. He was clearly loving what the boys were serving up.

Nelly didn't hit the stage until the final third of the song, and once again, the camera panned to Usher, who was groovin' in his big red chair. We'd bet the farm that Florida Georgia Line converted Usher into a country fan. Even pint-sized pop queen Shakira was rocking out!

With sparks shooting on the stage and some pyro blazing in the background, it was a full production and a terrific performance. Hopefully, Florida Georgia Line made some new fans by appearing on 'The Voice' Season 4 finale.

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