Klum and her children travel frequently, and sometimes she will get concerned looks from other passengers on planes when they see four children, ages 10 to 15, climb aboard.
"Normally, there's a certain amount of time they can play, but when we're on the airplane, the sky is the limit. By the time we land, they have square eyeballs," Klum told People in 2018.
Klum's eldest daughter, Leni, who has private social media accounts just for friends, shows her mom what photos she wants to post on Instagram before she does it.
"They're all getting sexier and sexier, and I feel like there's a time and place and a certain age group when you can do that for yourself, so sometimes she shows me photos and I'm like, 'Eh, maybe not that one, show me other photos,'" Klum said. "Even though it's just her friends, you never know who they could send it to."