The 24-year-old gave birth to son Luca Cruz Comrie — her first with husband Mike Comrie — in March. She was criticized by some for not losing her baby weight right away, but she wasn't too worried about it.
"I think if you ask any pregnant mom, they're like 'I want my body back,' but it takes time," she told Us Weekly. "It takes nine months for your body to get that way and it's putting on that weight on purpose."
That's not to say she wasn't busy working on her fitness. Duff told SheKnows all about her workout routine in August.
"I try to get an hour at the gym or I’ll go on walks and take Luca for walks," she told us, adding that she works with celebrity trainer Harley Pasternak. "I do a bit of spinning or Pilates."
And she's focused on her diet, too.
"I am the main cook," Duff said of her household. "Mike is not that great in the kitchen and I think he established that when he messed up a box of macaroni and cheese once. I’m still convinced he did that on purpose so I don’t ask him any more."