Heidi Klum and the Kids: Dance Studio Darlings

Tending to her three eldest children while leaving baby Lou back at home, Heidi Klum was in mommy mode in West Hollywood, California on Saturday afternoon (October 23).

The "Project Runway" babe dutifully escorted Leni, Johan and Henry over to Leni's ballet class at Sophie Dance before scooping up a frozen yogurt treat at the local Yogurtland.

Earlier in the morning, the happy family also ventured over to their routine karate class session - making for quite the active start to the weekend.

Meanwhile, Miss Klum is gearing up for what will be quite the busy week - as she's scheduled to fly out to New York City to prepare for her annual Halloween bash.

As for her costume plans - which are being kept a secret - the 37-year-old recently told FabSugar, “It is larger than life, literally. I’ll be towering over everybody.”

Enjoy the pictures of Heidi Klum spending the day with her kiddies (October 23).