March 27, 2012 02:30 PM

Milton Ventura/Broadimage

For her latest role, Hilary Duff‘s finding out that the hours are rough but the joys are enormous.

“Luca fed! Mamma fed! Time to do it all again in 2 hours!” the new mom to week-old son Luca Cruz Tweeted on Monday. “Oh how life has changed! In such a wonderful way.”

In fact, her whole household now revolves around keeping people fed: big sister Haylie came over to make a kale salad and truffle deviled eggs, though Hilary suspected an ulterior motive.

“I think it’s more about her getting time with Luca but I take it!” she jokes.

Then it was a few hours sleep before the hunger bell rang again.

“4 am … Sleepy eyed,” Duff, 24, Tweeted Tuesday. “Feeding baby … whew this job is no joke!”

Luca is the first child for the singer/actress and husband Mike Comrie.

“Wow, I can’t believe I have a baby!” she Tweeted Friday. “Thank you for all the messages and well wishes. I love you all so much.”

— Mike Fleeman

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