The Oscar nominee was joined by her fiancé, Danny Fujikawa, as the family enjoyed a bit of exercise in the sunshine.
Kate strapped her daughter Rani Rose, aged three, to her back with a complicated-looking black and gray harness.
The blonde beauty revealed her strength as the average weight of a three-year-old girl is about 30lbs and the average height is around 37 inches, according to the US Centers for Disease Control and Prevention (CDC).
Kate beamed at the cameras as she sported a pair of fitness trainers teamed with cycling shorts and a crop top.
Her daughter could be seen poking her head out from behind her mum while attached to her back.