Justin Timberlake took aim at Justin Bieber during "SNL" rehearsals last week ... saying in an unaired sketch, "Why don't you put a wig on a chipmunk and tell it to act like a Black man!"
During the sketch -- in which JT plays Wolfgang Mozart -- Timberlake jokes about his pursuit of an acting career, his lack of accolades for "The Social Network" and public fascination with Bieber.
When JT's posse threatens to start hanging out with Bieber in the sketch, Timberlake drops the line -- "Why don't you put a wig on a chipmunk and tell it to act like a Black man!"
So far, Bieber has yet to tweet about the situation.
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