She has been hitting the gym hard since giving birth to her son Luca back in March, regularly attending Pilates classes and spotted working out with her personal trainer.
And Hilary Duff's hard work is definitely paying off – the actress is back in her size 26 skinny jeans. Tweeting a picture of the tiny trousers, which are the equivalent of a UK size 8, the yummy mummy said, referring to her personal trainer: "@gabejohns your kicking my ass and its paying off! [sic]."
"Skinny jeans! LETS GO!" she continued excitedly.
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Hilary was showing off her post-baby weight loss in Los Angeles last weekend. Wearing what are thought to be the size 26 jeans she posted a picture of, the 25-year-old looked gorgeous as she took a stroll with baby Luca.
Back in June, the blonde beauty opened up about her quest to shed the post-pregnancy pounds, sharing her refreshing approach to the issue. "I think if you ask any pregnant mom, they're like, 'I want my body back,'" she said.
"But it takes time. I'm breastfeeding, so you have to be careful and not do anything too drastic."
And she was realistic about the results. "This is how it goes for most women—the weight doesn't fall off overnight," she said. "I'm not back to where I want to be, but I'm not stressing about it."
Since giving birth nine months ago, Hilary has kept up a number of activities including shadow boxing, pilates and yoga.
And she has also been keeping up a healthy diet alongside her exercise regime, sharing a photo of her morning snack – green juice, a celeb favourite nutrient-dense beverage designed to help cleanse your system. The picture also showed Luca's cup full of the vitamin drink.
The actress and her husband Mike Comrie welcomed little Luca on March 23. Hilary tweeted her fans when she gave birth saying: "Welcome to the World Luca Cruz Comrie! Tuesday evening, we became proud parents of a healthy 7 pound 6 ounce beautiful boy."
She later told fans of her and Mike's happiness: "We are overjoyed and feel like the luckiest parents in the world."
And she gave fans a first glimpse of her newborn baby on Twitter, posting a photo of her little boy Luca's tiny toes.
She captioned it: "My favorite little feet". A day later, she revealed the rest of the cute little boy. The singer posted a couple of photos of two-week-old Luca Cruz Comrie on her website.
In one, the newborn is swaddled in a blanket, and gazes at the camera with his blue-grey eyes – which are the same shade as his mum's.
"Baby Luca, 2 weeks old :)," reads the caption.
Hilary followed this up with another snap, and she commented: "Oh no! The flood gates have opened! Proud mamma on the loose! I can't help myself."