Justin Bieber has struck musical gold with Usher, Big Sean and Nicki Minaj in the past, but we never thought he'd try out this duet.

The Biebs showed up in Berlin to perform with rock legend Bryan Adams on Tuesday night, much to the surprise of Beliebers and Adams fans alike. The two busted out an acoustic rendition of Bieber's 2010 hit "Baby."

Confused? Me too.

Turns out, Biebs' and Bry's label, Universal, was holding an event, and naturally, the label had their biggest stars come together for it. Justin is currently in Europe promoting his single, "What Do You Mean?"

It's just too bad that Bryan Adams didn't step up and try to rap Ludacris' part. Next time, Bryan, next time.