Kristin Cavallari, author of the newly released book Balancing in Heels and once-cast member on "Laguna Beach," has officially reached level 100 on the celebrity mother scale, as evidenced by a recent Instagram photo. The picture shows Cavallari in a teeny bikini, sporting those trendy reflective sunglasses and holding up a breast pump. To top it all off, she's tagged a luxury vacation company because she's celebrity enough to be a spokesperson for that.

Thank you @inspirato for this gorgeous view while I pump 🙌🏻 #DutyCalls #Inspirato

A photo posted by Kristin Cavallari (@kristincavallari) on

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Back in November, according to People, Cavallari popped out her third kid, Saylor. Her other kids with sporty husband Jay Culter are coming up on the fun ages of two and four. With all these young ones around, Cavallari has been mom-ing hard on the Instagram recently.

This sums up today. Coming for that glass of wine behind me the second I'm done feeding Saylor 😜

A photo posted by Kristin Cavallari (@kristincavallari) on

First girls trip in the books. See ya next time, LA.

A photo posted by Kristin Cavallari (@kristincavallari) on

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