By Dan Snierson
Updated April 28, 2011 at 12:00 PM EDT

January Jones, who stars as Betty Francis on the AMC drama Mad Men, is pregnant, reports People. In confirming the news to the magazine, a representative for the actress did not reveal the identity of the father, but noted that the baby, Jones’ first, is due this fall. Jones stars in June’s X-Men: First Class, while the fifth season of Mad Men premieres in 2012.