Here's a sneak peek of Justin Bieber singing an acoustic version of "Baby" at Nickelodeon's Mega Music Festival:
The Nickelodeon Mega Music Fest will premiere on Labor Day, Monday, September 6, at 8 p.m. ET/PT on Nickelodeon.
Are you going to tune in?
Photo: Vince Bucci/PictureGroup/Nickelodeon
