VIDEO: Justin Bieber & Ludacris Surprise Fans with Performance of 'Baby'

Fans in attendance at Justin Beiber's concert in Atlanta, Georgia last night got a special surprise when Ludacris joined the pop star on stage for a performance of their 2010 hit son "Baby."

The rapper shared footage and a photo of the event on Instagram, along with the caption: "Reunited Rockin wit the Biebs. Surprised ATL tonight. #showkillas". Check out the clip below!

Bieber has received numerous awards, including both Artist of the Year Awards at the 2010 American Music Awards and the 2012 American Music Awards, and was nominated for Best New Artist and Best Pop Vocal Album at the 53rd Grammy Awards.

With a global fan base, termed as "Beliebers", and over 40 million followers on Twitter, he was named by Forbes magazine in 2012 as the third-most powerful celebrity in the world.

Photo: Instagram