Stevie Wonder may be a legend, but it was Justin Bieber who had all the girls screaming at Stevie’s 16th Annual House Full of Toys benefit concert on Saturday night. The 17-year-old pop star joined the musical genius on the holiday classic “Someday at Christmas” at the Nokia Theatre in Los Angeles.

Following their duet, Justin performed acoustic versions of his Christmas songs including “Mistletoe” and the Chris Brown-penned “Christmas Eve,” plus his hit single “Baby.”

“So 4 years ago I sang this song in my hometown. now 4 years later I sang it 2nite with STEVIE WONDER! #NEVERSAYNEVER,” tweeted Biebs following the momentous evening.