“Summer of ’69” singer Bryan Adams joined fellow Canadian Justin Bieber onstage Tuesday to perform “Baby” — Bieber’s monstrous 2010 hit that is also the most-disliked video on YouTube with 5 million thumbs-down (and 1.2 billion views).

Adams, 55, and Bieber, 21, tackled the surprise duet in Berlin, Germany, during Universal Inside, an intimate Universal Music Group event at Mercedes-Benz Arena. Bieber took the lead, with a vocal assist from a guitar-toting Adams during the chorus.

Earlier this month, Bieber’s “What Do You Mean?” debuted at No. 1 on Billboard‘s Hot 100, making him the youngest male to accomplish the feat. The song also broke Spotify’s record for most streams in a debut week. Read more…

More about Music, Celebrities, Justin Bieber, Entertainment, and Videos

Excerpt from:

Unlikely duo Justin Bieber and Bryan Adams sing acoustic ‘Baby’ together