Justin Bieber's Coachella Surprise

Bieber serenaded Eilish with his 2009 hit 'One Less Lonely Girl' in a moment that quickly went viral online.

The performance also featured appearances from Sexyy Red and Big Sean, delighting the massive crowd at the Empire Polo Club.

Fans noted that Bieber appeared more at ease and engaged during his debut as a festival headliner.

The setlist included a mix of his classic hits and newer tracks, solidifying his successful return to the live stage.