Following the birth of her son Luca Cruz Comrie in March 2012 she's worked tirelessly to get back into tip-top shape.
And continuing on her journey Hilary Duff was seen leaving another Pilates class in Studio City, California on Monday afternoon.
But choosing to sweat in style, the 25-year-old actress stepped out in an outfit set to make her fellow gym buddies green with envy.
Making her way to her 4x4, Hilary strutted along in a pair of black workout trainers and leggings topped with a camouflage green vest top.
Matching her top to her leather olive Celine handbag, Duff appeared to be in good spirits following her strenuous session.
Wearing her blonde hair down in a side parting, the Metamorphosis singer finished her look with a pair of aviator sunglasses as she clutched her phone in one hand.
Happy: Hilary was all smiles as she matched her olive Celine bag to her ensemble
During her class which is a mix of standing Pilates, boxing and dance, Hilary posted a picture of herself and a friend to her Twitter page.
The caption on the image, which sees Hilary holding her fingers above her lips, read: 'Look who I found @lucytwobows !!! @piloxing'.
Hilary recently returned to her first love - acting - with a guest starring stint on Fox's Raising Hope.