Popsugar Entertainment Shawn Mendes Justin Timberlake and Shawn Mendes iHeartRadio Performance Justin Timberlake and Shawn Mendes Performed a Sexy Duet, and BRB While We Try to Find Our Chill 25 September 2018 by Kelsie Gibson First Published: 24 September 2018 View On One Page Photo 1 of 29 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Justin Timberlake and Shawn Mendes duet at iHeart Radio Music Festival Previous Next Start Slideshow Shawn MendesMusicJustin Timberlake