Hilary Duff white jeans baby luca flats sleep She looks unbelievable!

Hilary Duff carried her sleepy son Luca out of Mommy-And-Me class yesterday, and the Lizzie Maguire star decided to show off her post baby body in a pair of tight white jeans. Adorbs!

The singer/actress never steps out without her baby boy, and it sounds like the little one is really growing up quickly!

"I'm at a really fun stage right now. My son is 13 months, so we just celebrated his first birthday. He's running around everywhere. He knows what he wants and what he doesn't like and really has a personality now," she recently told omg! Insider .

The Duffster hasn't totally put her career on the back burner for motherhood, though!

"I'm starting to get back into the studio again - I want to work on my music, but it's tough to be pulled away from Luca. Whatever I work on, I want it to be worth missing time with him," she added.

Can't wait to hear the new tunes, Hil!