The 34-year-old brunette was spotted on her way to a baby class with her adorable tiny tot on Wednesday (21 November) and continued her recent run of funky, casual ensembles by sporting a pair of ripped skinny jeans instead of her usual pencil skirts and fancy frocks.
She completed her look with a black shirt, a pair of open-toe heels and a backwards leather cap. Yummy mummy indeed!
Kourtney also appeared to be wearing less makeup than normal and carried a large Prada holdall, which no doubt contained all of her daughter's essentials.
Even Penelope's nappies travel in style!
The mother-of-two has been pictured dressed in much more casual outfits as of late.
Earlier this month, she was seen out in New York with longtime boyfriend Scott Disick wearing flat (yes, flat!) biker boots and a simple leather jacket, while last week she ditched her figure hugging trousers for a pair of baggy, boyfriend fit jeans.
And we have to admit, we're loving seeing this new understated wardrobe on her.
Proving that she's already inherited her mum's good fashion sense, Penelope wore a super patterned top yesterday, which was teamed with some beige bottoms and matching coloured moccasins. Aww!
As Kourtney occupies herself by taking care of her daughter and three-year-old son Mason, her sister Khloe has been jet setting across the globe promoting their Kardashian Kollection clothing range and throwing lavish launch parties in London, Amsterdam and Australia.
And their 33-year-old sister Kim has been busy too, supporting her fiancé Kanye West in New York as he continues his Yeezus tour and looking after their five-month-old baby girl, North.
What do you think of Kourtney's laid-back style? Let us know below, as the best comment across the website each week wins £50!