Surprising Celebrity Pregnancies

January Jones

By KRISTA WICK

Just three months after splitting with Saturday Night Live's Jason Sudekis, Mad Men star January Jones announced, pretty much out of the blue, that she was pregnant and ready to take on life as a single mom.

"January Jones is happy to announce that she is expecting her first child this fall," her rep told PEOPLE in April 2011.

Jones gave birth to son Xander Dane Jones on Sept. 13, 2011 and 'til this very day, the star remains notoriously secretive about her baby's daddy, but speculation surrounds X-Men: First Class director Matthew Vaughn, SNL's Jason Sudekis and Food Network grillmaster Bobby Flay.