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Kristin Cavallari, Instagram

Instagram

When the kids are away, it's not exactly time for Kristin Cavallari to play.

In recent days, the former Laguna Beach star has been hard at work traveling in support of her new book. But before you think this fashion designer and author is whooping it up on a mini-vacation, all signs point to a working mom who has her children always on the mind.

Before heading back home to Chicago to be reunited with husband Jay Cutler and their three youngest family members, the Balancing in Heels star shared a picture of herself preparing for a flight that included a round of breast pumping.

"The glamorous side of the #BalancinginHeels #BookTour," she shared on Instagram while filling up a bottle of breast milk.

Kristin later added, "[Peace] out NYC...always a good time. Chicago here we come!"

The reality star has been open about how she got healthy after giving birth. Earlier this year, Kristin revealed just a few tips that worked for her after welcoming baby No. 3.

"Breastfeeding helps a lot and eating the way I always do after having her. I avoid processed food as much as possible and I rely on tons of veggies, protein and complex carbs," she explained to E! News exclusively. "I eat real food, including bacon and butter. I stay away from certain additives, which I talk a lot about in my book, and I eat organic as much as possible. I mostly eat at home and cook my meals so I know exactly what I am getting."

While there are plenty of lifestyle and fitness tips in her new book, many fans can't stop buzzing about the confessions made about Kristin's time on Laguna Beach.

Whether discussing her relationship with ex-boyfriend Stephen Colletti or revealing which scenes were "manipulated" for dramatic effect, Kristin keeps it 100 percent real in her latest work.

"I can't believe it's finally here," Kristin shared on Instagram once the book hit shelves. "I hope you all enjoy it. I poured my heart into this book."