Tina Fey might just be the hardest workin' woman in show biz.

We spotted the 30 Rock actress with co-star Jack McBrayer shooting scenes for an upcoming show on location in New York City this afternoon; looks like the cast hasn't taken off for the holidays just yet. 

Did y'all see last week's Christmas episode?  Check out a clip of Liz Lemon trying to give two under privileged children some holiday gifts and subsequently squashing their innocence.