Behind the scenes at the new Wallace and Gromit film! VideoBehind the scenes at the new Wallace and Gromit film!

Hilary Duff isn't just a regular mom --- she's a cool mom. The "Lizzie McGuire" alum, 37, stepped out with her eldest child, her 12-year-old son Luca, in New York City on Dec. 12 for a Broadway event.