Then you're going to LIVE for this video!!!
She's gone undercover -- and she OWNS it!
Ch-ch-check out the video for Birthday here (above)!
Congratz, Tina Fey!
The 30 Rock creator, writer, and star won the SAG Award for Outstanding Performance by a Female Actor in a Comedy Series!
So HIGHlarious! We'll miss you, Liz Lemon!
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