The showbiz matriarch was assisted by party planner Sharon Sacks in organising the bash for her 33-year-old daughter - who is expecting her second child, a girl, with partner Scott Disick - at her Californian home, with around 90 guests.
A source said: ''Kourtney's shower was so nice!. Her mom and sisters were there, of course.
''They talked, laughed, and played games. There was a bar and lots of different types of foods and desserts, including sushi and little sandwiches. She seemed happy and excited earlier in the day before the shower.
''There were about 90 people at 10 tables.''
The insider added to Life & Style magazine: ''Flowers were blush-pink peonies, pink Dutch hydrangeas and garden sweet peas in pink-and-fuchsia containers. The theme was all pink and whites. Petals LA did the floral arrangements.
''Lehr & Black did Kourtney's shower invitations. They were beautiful.''
The guests bombarded Kourtney with gifts for her impending new arrival, with the reality TV star having registered with Bel Bambini and requesting items including a $349 video monitor set, car seat, embroidered bibs and teething toys.
The source said: ''Kourtney got lots of gifts from Bel Bambini.''
Another onlooker added: ''Multiple women arrived bearing numerous gifts for Kourtney's new baby. At one point, a Toyota van drove up to the property and numerous people rushed over to the car to help a blonde female carry a huge gift, in black-and-white wrapping paper and a big red bow, into the house.''
However, none of the guests left the party empty-handed.
The source said: ''Kourtney and her family had gift bags for all the guests.''
The event was Kourtney's second baby shower.
Last month, Scott's family threw a party for the couple at Stonewalls Restaurant at The Woods at Cherry Creek in New York.