“[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.