She may play an icy blonde on the Emmy-winning Mad Men
, but in real-life January Jones
is one red-hot mama
Barely more than two weeks after her first child, Xander Dane Jones, was born on Sept. 13
, the actress, 33, was seen out and about with him – and back in beautiful shape.
As for how her maternity might play out on the new season of the AMC hit, costar Jon Hamm
, 40, told PEOPLE at this past weekend's Rape Foundation Annual Brunch, hosted by the cast of Mad Men
: "I'll let you see that when you see it, but she is no longer pregnant. She has had a baby, and she's very excited and happy and healthy. Both sides are very healthy and happy, which is very sweet."
Regarding cast reaction to the birth, he says, "We're just excited that she got through the whole situation healthy."
Costar John Slattery, 49, who saw a baby photo, concurs, saying, "[Her son's] beautiful. … She's very sweet, very funny, and she's in love with that boy."
Reporting by GABRIELLE OLYA