Justin Timberlake and Shawn Mendes have stunned fans with a surprise duet.
Opening the second night of the iHeartRadio Music Festival in Las Vegas on Saturday (22Sep18), Timberlake brought the T-Mobile Arena to a standstill by revealing the identity of his special guest.
"Can I do something special for you tonight?" he asked the crowd. "Ladies and gentlemen, I'm a big fan of this young man. He's one of the coolest cats I've met, he's very talented, and he's about to bless you - please welcome Shawn Mendes to the stage."
The Canadian star then came out to perform with Timberlake on his song What Goes Around... Comes Around.
Mendes later posted a snap from their duet on Instagram, showing them both playing guitars for the acoustic version of the 2006 track.
"Thank you @justintimberlake for being such an incredible guy," he gushed.
Timberlake performed a hit-laden set at the iHeartRadio Music Festival, including popular tunes Sexy Back, Man of the Woods and Cry Me A River, but chose to close the show with Can't Stop the Feeling.
Mendes previously described the 37-year-old singer-songwriter as one of his biggest influences and revealed he was listening to Timberlake's music when he was writing his recent track Lost in Japan.
"I had this dream that I was lost in this country and I woke up the next day and we had this cool piano part and the song was birthed," he explained.
Mendes also performed his own set later on at the iHeartRadio Music Festival. Other guests included Carrie Underwood, Kelly Clarkson, Lynyrd Skynyrd and Imagine Dragons.