United Kingdom, July 10 -- Kristin Cavallari makes her children fly in economy when she is in first class.

The 39-year-old businesswoman and fashion designer has three kids, Camden Jack, 13, Jaxon, 12, and Saylor, 10 - with her ex Jay Cutler - and she believes it is "good for them" to know they need to work hard for life's luxuries.

Speaking on the Aspire with Emma Grede podcast, she said: "My kids don't just get whatever they want. And if they want something, they have to work for it.

"Something as small as they fly coach, I'm flying first class.

"That was important to me when they became old enough that they could. It's not [difficult to do] when they're older. I'm like, 'Bye guys, have fun back there.'

"It's good for them. And I t...