Chris Young gave fans a huge surprise on night three of CMA Fest 2017. Click play above to watch Cassadee Pope join Young on stage for a special performance of their duet, "Think of You."

When Young took the stage at Nissan Stadium on Saturday (June 10), fans were of course expecting the country singer to perform his Grammys-nominated No. 1 track, but no one could have guessed that he'd be joined by his duet partner for the sultry breakup ballad. So when Pope walked on stage as the first few bars of "Think of You" began, the crowd erupted with joy. In fact, the screaming was so loud, it almost drowned out the duo as they sang their chart-topping, record-setting song.

"Think of You" is the second single off Young's fifth studio album I'm Comin' Over. Written by the singer alongside Corey Crowder and Josh Hoge, the nostalgic breakup song finds two ex-lovers pining for lost love: given their longtime friendship, Young knew Pope was the perfect partner to sing alongside him. Multiple award nominations, a No. 1 certification and a Golden Boot Award later and "Think of You" has become a signature song in both Young and Pope's career.

The surprise duet was part of Young's 30-minute set on night two of Nashville's CMA Music Festival. Packed full of many of his nine No. 1 hits, Young opened with party rocker, "Aw Naw," following it up with I'm Comin' Over's title track, a slow and sexy ballad that perfectly matches the singer's deep baritone. Also in rotation was Young's latest single "Losing Sleep" as well as oldies like "Gettin' You Home (The Black Dress Song)," which was Young's very first chart-topping single, released in 2009.

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