Film and TV Actress who played Betty Draper on Mad Men. She also played Cadence in American Wedding, Emma Frost in X-Men: First Class and, in 2014, she began playing Melissa Shart on The Last Man on Earth.
She worked as a counter girl at Dairy Queen after school.
She dated Josh Groban from 2003 to 2006.
She had a son named Xander Dane Jones in 2011. She dated actor Will Forte in 2015.
Her name comes from the character January Wayne in Jacqueline Susann's novel Once Is Not Enough.