Justin Timberlake & Shawn Mendes make a great couple.

A true highlight from our iHeartRadio Music Festival happened Saturday night when Justin Timberlake brought Shawn Mendes to the stage for a surprise duet.

The two strummed their guitars and got the ladies worked up to two of JT's hits, beginning with "What Goes Around...Comes Around.

Here's their performance together. Watch a replay of the best from the Fest over two nights, Sunday October 7 and Monday October 8 on the CW.

The Mayor Pete Kennedy

The Mayor Pete Kennedy

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