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 Image Source: Getty / Ethan Miller Two of our favourite heartthrobs just shared the stage, and we've officially lost our chill! During the iHeartRadio Music Festival on Sept. 22, Justin Timberlake surprised the crowd by bringing out Shawn Mendes for a special performance of "What Goes Around . . . Comes Around," and it was just as epic as it sounds. The two showed off their swoon-worthy vocals as they crooned the lyrics to the stripped down version of the song. Before bringing Shawn on stage, Justin couldn't help but gush about the 20-year-old saying he was "one of the coolest cats I've met." And it seems like Shawn was just as star-struck. After their duet, the singer thanked Justin on Instagram writing, "Thank you @justintimberlake for being such an incredible guy." Can these two do more music together ASAP? Justin Timberlake and Shawn Mendes duet at iHeart Radio Music Festival 1 / 29 I think this @jtimberlake + @ShawnMendes just stole the show tonight at #iHeartFestival pic.twitter.com/jdCu84Fxz3— BATTLE (@battleonair) September 23, 2018 2 / 29 Shawn a cantar What Goes Around com o Justin Timberlake pic.twitter.com/3JH3Kw6Mpe— Shawn M. Portugal (@MendesArmyPT) September 23, 2018 3 / 29 Tonight @ShawnMendes @iHeartFestival pic.twitter.com/hyUgiXTa2A— Justin Timberlake (@jtimberlake) September 23, 2018 4 / 29 Image Source: Getty / Kevin Winter 5 / 29 Image Source: Getty / Rich Fury 6 / 29 Image Source: Getty / Kevin Mazur 7 / 29 Image Source: Getty / Kevin Mazur 8 / 29 Image Source: Getty / Rich Fury 9 / 29 Image Source: Getty / Kevin Mazur 10 / 29 Image Source: Getty / VALERIE MACON 11 / 29 Image Source: Getty / Denise Truscello 12 / 29 Image Source: Getty / Denise Truscello 13 / 29 Image Source: Getty / Kevin Winter 14 / 29 Image Source: Getty / Kevin Winter 15 / 29 Image Source: Getty / Kevin Winter 16 / 29 Image Source: Getty / Kevin Winter 17 / 29 Image Source: Getty / Kevin Winter 18 / 29 Image Source: Getty / Kevin Winter 19 / 29 Image Source: Getty / Ethan Miller 20 / 29 Image Source: Getty / Ethan Miller 21 / 29 Image Source: Getty / Ethan Miller 22 / 29 Image Source: Getty / Ethan Miller 23 / 29 Image Source: Getty / Ethan Miller 24 / 29 Image Source: Getty / Ethan Miller 25 / 29 Image Source: Getty / Ethan Miller 26 / 29 Image Source: Getty / Ethan Miller 27 / 29 Image Source: Getty / Ethan Miller 28 / 29 Image Source: Getty / Ethan Miller 29 / 29 Shawn MendesMusicJustin Timberlake