​From Wikipedia, the free encyclopedia.   Crista Flanagan (born February 24, 1976) is an American comedic actress best known for her work as a cast member on the FOX sketch comedy series MADtv from 2005 to 2009 and for her recurring role as Lois Sadler on the AMC series Mad Men. Description above from the Wikipedia article Crista Flanagan, licensed under CC-BY-SA, full list of contributors on Wikipedia.