Elisabeth Moss: I'm "So Proud" of New Mom January Jones

Moss says that her Mad Men costar, who gave birth to son Xander Dane Tuesday, is "going to be a great mom"

Mad Men star January Jones gave birth to a baby boy named Xander Dane on Tuesday, and her costar Elisabeth Moss has come out in strong support, telling Us Weekly, "I think she's going to be a great mom."

Jones, 33, who has been romantically linked with Jason Sudeikis and Josh Groban in the past, has not revealed the identity of the father. Rumors circulated that Matthew Vaughn, the director of this summer's superhero blockbuster X-Men: First Class, in which Jones played icy villain Emma Frost, was the father -- but Vaughn, who's married to model Claudia Schiffer, categorically denies the rumors. For her part, Jones hasn't given out any hints.

Jones' reputation as an actress has taken a bit of a beating in the last couple of months. She was categorically panned for her role in X-Men, and Jared Gilmore, the 11-year-old who plays her son on Mad Men, made some not-so-nice comments about his TV mom last month. "Be careful around January (Jones)," he told TV Guide. "She's not as approachable as the others... Everyone else is so nice."

Mad Men costar John Slattery immediately came to her defense, calling Jones a "sweetheart" -- and that's a sentiment Moss and the show's other cast members seem to share.

"She's a very caring and protective person, and I think she's going to fit in very well with motherhood," Moss, 29, tells Us. "We're all so proud of her and happy for her and she's doing really well. We're all really excited to meet the baby."

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