Tina Fey and Justin Bieber rock "Saturday Night Live"

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Tina Fey of NBC's 30 Rock and Parks and Rec and "Twitter Top Tag King" teen pop star Justin Bieber rock "Saturday Night Live" tonight, with a classic work of SNL comedy where Tina Fey plays a teacher who fantasizes about a student played by Justin Bieber during class.

The skit is punctuated by dream sequences where Justin Bieber sings a romantic rap to Fey. Then Fey comes out of her dream to realize she's talking to herself before her class.

The NBC skit video's not up yet; here's the promo:



Tina Fey and Justin Bieber on "Saturday Night Live". Great television.

Stay tuned.