January Jones Debuts Newborn Son Xander On the Set of Mad Men

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January Jones brought her one-month-old son Xander to the Los Angeles set of Mad Men yesterday, and this is our first look at the 33-year-old starlet's baby boy.

Jones introduced Xander to John Slattery and several other cast members, and co-star Elisabeth Moss recently told Us Weekly, “I think she’s going to be a great mom. She’s a very caring and protective person, and I think she’s going to fit in very well with motherhood.”

Xander Dane Jones was born on September 13, and though we still don't know who the father is, the tiny tot certainly is a cutie!