Sounds like January Jones is as icy as the mom she portrays on Mad Men. Kid actor Jared Gilmore, who plays the son of Jones' Betty and Don Draper, had some dissing words of advice for his replacement. "Be careful around January. She's not as approachable as the others," he tells TV Guide. "She's really serious about what she does. Everyone else is so nice." No word from snooty Betty. Gilmore, 11, is leaving the show to be a regular on ABC's upcoming Once Upon a Time, which launches in October. Mad Men will be back on the air next year. Click for more Mad Men gossip. (More January Jones stories.)