Jared Gilmore, who played the Emmy-nominated actress' son Bobby on 'Mad Men,' had some words of advice for the next young actor who takes his place.

"Be careful around January [Jones]," he told TV Guide Magazine. "She's not as approachable as the others. She's really serious about what she does. Everyone else is so nice."

Uh oh -- when a little boy is scared to talk to you, you might want to re-examine your public persona.

Gilmore dropped out of 'Mad Men' to play a big part in ABC's fairy tale drama 'Once Upon a Time.' In the new series, he plays Henry, son of Jennifer Morrison's Emma. It just so happens Emma is the daughter of Snow White and holds the key to saving the Enchanted Forest and its fairy tale inhabitants.

'Once Upon a Time' premieres Sun., Oct. 23 at 8PM.