I think the song you are referring to is "How Low Can You Go' in which Ludacris does half of the bridge in a distorted litlle kid voice.
Ludacris- How low can u go
Christopher Brian Bridges is ludacris name
Organized Noize
Chris Bridges
Karma and andrell martin
Ludacris
the song is "baby" by justin bieber featuring Ludacris
Ludicrous aka Luda feats Justin Bieber in baby
Kyra Alley
Ludacris
Ludacris
Ludacris.
Ludacris
Justin Bieber- Baby ft Ludacris
Ludacris.
Ludacris helped Justin Bieber with his song Baby.
Ludacris - Get Back oorrr Flo Rida - Get Low