Justin Bieber debuted his new song “Baby” on his official youtube account! Says Justin of the song:

Here is an acoustic sneak peek of my new single “BABY” which comes out on ITUNES this Monday January 18th, 2010 and features LUDACRIS!! Spread the word and let’s help make it my first ever #1 on ITUNES!! All this is really a dream and not possible without the amazing support you all have given me on youtube, facebook, twitter, and around the world. Thanks for making dreams for a small town kid.
thank you

-Justin