January Kristen Jones (born January 5, 1978) is an American actress and model. She played Betty Draper in Mad Men (2007–2015), for which she was nominated for two Golden Globe Awards for Best Actress – Television Series Drama and a Primetime Emmy Award for Outstanding Lead Actress in a Drama Series. She also portrayed Melissa Chartres in The Last Man on Earth (2015–2018) and has starred in films such as American Wedding (2003), We Are Marshall (2006), The Boat That Rocked (2009), Unknown (2011), Seeking Justice (2011), and X-Men: First Class (2011).

Early life
January Kristen Jones was born in Sioux Falls, South Dakota, on January 5, 1978, the daughter of store manager Karen Cox and exercise physiologist Marvin Jones. She was named after January Wayne, a character in the 1973 Jacqueline Susann novel Once Is Not Enough. The names of her two sisters also start with the letter J, Jina and Jacey. In 1979, her family moved to Hecla, South Dakota, but moved back to Sioux Falls in 1996, where she graduated from Roosevelt High School.