The Mad men actress, who mysteriously kept the name of her child’s father a secret, has given birth.
Jones welcomed her first child, son Xander Dane Jones, on Tuesday.
The new mom and baby are “doing great,” her rep says.
January announced her pregnancy in April and chose not to know the sex of her child until birth.
Since she refused to name the father of her baby, speculation was rife, with rumors pointing at her ex-boyfriend, Saturday Night Live star Jason Sudeikis, or even Matthew Vaughn, director of X-Men: First Class and husband to Claudia Schiffer.