Kourtney Kardashian stepped out with son Mason and daughter Penelope in Malibu over the weekend, and we can't believe how big her two oldest kids are getting!

Kourtney wore a sexy pair of daisy dukes and a white tank, but it was little Penelope who caught our eye. The 4-year-old was wearing a Yeezus shirt (presumably dad Scott's) and it was so long it was practically dragging on the ground.

Kourt recently revealed that she has mixed feelings about sticking with Keeping Up With The Kardashians -- and putting her kids on the reality TV show. “I don’t want the show to end, but I sometimes think I would be so happy if it did and I could just move away from it all,” she told Sunday You magazine. “By the end of every season I’ve had enough, but then once we have had a break I’m ready for more.”

"I wanted the children to feel free to run about where they wanted – it’s their home, after all – so it was easier to let them," she added. "They have known the crew all their lives and the team are very respectful about leaving at 6 p.m., when I like to have family time.”