VIDEO: Justin Bieber & Bryan Adams Perform Acoustical Version of 'Baby'

Below, watch a spontaneous duet of two superstars on stage at Universal Inside 2015 in Berlin. Justin Bieber and Bryan Adams are perform Justin's hit-single "Baby" live and acoustic.

Beiber's new album will be released November 13. His new single "What Do You Mean?" is now available on iTunes.

Global superstarJustin Bieber's brand new single,"What Do You Mean"took over the #1 spot at iTunes within nanoseconds of its globalrelease across all retail platforms. The arrival of "What Do You Mean" caps a hugely successful viral 30 day Instagram countdown and Twitter lyric reveal campaign, garnering over a 100 million impressions.

"It's been an amazing journey to write, record and deliver this record to my fans," said Justin. "I'm so glad people have participated in it, and Ihope they are receptive to it and love it as much as I do. This is only the first step in the journey for me. This album is so personal to me, there's so much of my heart and soul in it, and I can't wait to bring my fans along for the ride."