Justin Timberlake took to the stage of the T-Mobile Arena in Las Vegas on Saturday for the second night of the iHeartrRadio Music Festival, and in the midst of his performance revealed he had a special surprise in store, as reported by Billboard.

“Can I do something special for you tonight?” he asked fans.

After his question was met with cheers, he continued: “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.”

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With that, the Toronto-born singer-songwriter joined Timberlake onstage for a a duet of “What Goes Around… Comes Around,” with Mendes taking the second verse. Watch:

Timberlake later took to social media to share a photo of himself and Mendes backstage, and also shared some backstage video (on Instagram Story) of Mendes joining him and The Tennessee Kids for some backstage bonding ahead of the show.

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