January Jones backstage during the 2010 ESPY Awards on July 14, 2010, in Los Angeles.(Credit:Getty) (CBS) It’s a boy for actress January Jones. The “Mad Men” star welcomed Xander Dane Jones on Tuesday, her rep confirmed to People magazine. Pictures: Celebrity babiesPictures: January Jones Mother and child are “doing great,” the rep added. This is the first child for Jones, 33, who announced the pregnancy in April. She has kept mum on the identity of the baby’s father. “Mad Men” is set to return to AMC on March 16, 2012.