Watch Florida Georgia Line & John Legend Combine Forces at the 2017 Billboard Music Awards

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(L-R) Brian Kelley and Tyler Hubbard of Florida Georgia Line with John Legend perform onstage during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas.

Chart-topping country duo Florida Georgia Line is no stranger to unexpected, genre-hopping collaborations. So while most country artists would seem out of place onstage with an ultra-smooth, R&B stalwart like John Legend, this Billboard Music Awards performance just felt like another day at the office for ol’ FGL.

Okay, it was still pretty unexpected. The whole thing began a lot like most of Legend's performances, with the musician seated at a glistening grand piano, singing and playing his ballad "Surefire." But then, Tyler Hubbard and Brian Kelley appeared, and the trio bridged expertly into FGL's hit song "H.O.L.Y." 

Watch a clip of the performance below.