NEW PIC: See January Jones' Son Xander, 5 Months! (omg!)

Little Xander's growing up fast!

Prior to making her first post-baby red carpet appearance Saturday in Los Angeles, Mad Men's January Jones toted her son, Xander, around town Friday on a mommy and me lunch date.

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Stopping by Jamba Juice and Panda Express, Jones cradled her 5-month-old little boy, who donned a blue and white bib and white socks for the outing.

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Welcoming Xander Dane Jones on September 13, the Mad Men actress, 34, has yet to disclose her baby's father, but pals say she's a natural mom. "She's in love with that boy," Mad Men's John Slattery has said of his costar, who was back to work mere weeks after giving birth.

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"We're all so proud of her and happy for her and she's doing really well," costar Elizabeth Moss recently told Us Weekly.

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