January Jones Brings Baby Xander to Mad Men Set
10/12/2011 AT 10:50 AM EDT
The proud mom, 33, brought her 4-week-old son, Xander Dane Jones, to the set of her AMC drama on Tuesday. She was reportedly smiling from ear to ear as she introduced him to John Slattery and a few other cast members.
Xander, born Sept. 13, is Jones's first child.
Mad Men recently began filming its fifth season, due to premiere in 2012.
– Tim Nudd