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By Allie Caren

You might know her as Lizzie McGuire, but actress and singer Hilary Duff is all grown up now!

She’s still acting, but she has another new, more-permanent role: mom.

Duff’s son, Luca, is 4 years old. And from the looks of it, she just can’t get enough of him.

“He only makes every day matter so much more and the joy that I feel, the purpose, everything is so much more heightened,” Duff, 28, told TODAY.

Duff recently got divorced from Canadian retired ice hockey player Mike Comrie. |