Kourtney, 34, was pictured in Los Angeles while carrying Penelope on her hip as they headed to a baby class together.
The mum-of-two was wearing a long-sleeved mid-blue denim shirt which she teamed with a matching pair of skinny jeans.
Kourtney topped off her look with a pair of flat black ankle boots with silver studs, chunky straps and buckles, and wore her hair in loose waves swept to the side.
Penelope, meanwhile, looked relaxed in her mother's arms and happily chomped away on a rusk as they made their way down the street in Beverly Hills.
The 15-month-old tot was wearing a pretty white blouse with spots on, navy leggings and cute coordinating shoes.
It's been a busy week for the Kardashian family. On Tuesday (22 October), Kim Kardashian got engaged to her boyfriend of 18 months Kanye West and the entire clan flew out to San Francisco to watch their big moment.