Stars on Set Dec. 16-21, 2012

Stars got busy before the holiday break on sets across the country. Tina Fey wrapped work on the final episode of 30 Rock, while Zac Efron reported to the NYC set of Are We Officially Dating?. A pregnant Busy Philipps wore a colorful look for the cameras for a Cougar Town scene in LA, but there were plenty more celebrities on set. Click through to see them all!