In "Baby Mama," Tina Fey was an aunt-by-choice... sort of. But now, she's got the job for real -- and by choice -- since her BFF Amy Poehler gave birth to son Archie Arnett (with her husband, actor Will Arnett) on Saturday.

This kid has got a really cool aunt, too -- not only is she incredibly hysterical, she's also no doubt backed up by a long line of credit from American Express, which she stumps for. Here she comes, F.A.O. Schwarz!