IMDB trivia clearly hints that Jason Sudeikis is the 'Baby Daddy'
Was in a relationship with Jason Sudeikis (July 2010-January 2011).
Gave birth to her first child at age 33, a son Xander Dane Jones on September 13, 2011
Just 8 months after she broke up with Jason, she had a son. Clearly Jason is the father.