Mason Disick, Kourtney Kardashian and Penelope Disick
10/07/2013 AT 07:35 AM EDT
It's time for some fall fun for the Kardashian family.
took her children, Mason, 3, and Penelope, 15 months, to Underwood Farms Fall Festival
in Moorpark, Calif., on Sunday.
Joined by Kris Jenner
and makeup artist pal Joyce Bonelli, Kardashian "looked gorgeous" in a black floppy hat, sunglasses, loose white button-down and Converse sneakers, an onlooker tells PEOPLE.
The whole group took a ride on the tractor train and Kardashian's kids "were so well behaved," the source adds.
As the day went on, the group settled into the bleachers to watch a pig race. Sitting between Jenner and Bonelli, Kardashian held Penelope. "They were having so much fun!" the source says.
– Jennifer Garcia