December 21, 2012 03:00 PM

FameFlynet

Yum!

Mama Hilary Duff keeps 9-month-old son Luca Cruz occupied with a teething toy as they head out to a pediatrician appointment Thursday in Beverly Hills, Calif.

“[My husband] Mike [Comrie] and I are literally obsessed with Luca,” the actress and singer, 25, said recently.

“He’s into everything. I’m running around the house just trying to keep up with him. He’s so fast!”

Her baby boy isn’t kicking back this holiday season though — Duff Tweets that he’s hard at work taking a festive tune to heart.

“Luca is actually getting his two front teeth for Christmas!” she writes.

RELATED: Hilary Duff: Luca Loves Our Lopsided Christmas Tree

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