Kristin Cavallari is just weeks away from beginning a challenge that many moms understand – raising three kids.

“It’s hard to believe I will be a mom of 3 in just a few short weeks. I owe so much to my babies…they have changed me in so many ways for the better,” she said in a recent instagram post in which she shows off her baby bump.

It's hard to believe I will be a mom of 3 in just a few short weeks. I owe so much to my babies…they have changed me in so many ways for the better. I talk about my journey to mommy-hood, my pregnancies, and how these little guys have made me who I am today in #BalancingInHeels . The mommy and wife chapters are incredibly raw and real-I don't sugarcoat anything. I can't wait for u guys to read it! Available for pre-order at BalancingInHeelsBook.com ?

A photo posted by Kristin Cavallari (@kristincavallari) on Oct 21, 2015 at 10:46am PDT

Gonna try and really enjoy these last few weeks dressing the bump since I always miss it when it's gone ???

A photo posted by Kristin Cavallari (@kristincavallari) on Oct 19, 2015 at 9:18am PDT

But excitement is only one emotion Kristin Cavallari is feeling. The other?

Nervousness.

“I’m not going to lie to you, three kids kind of scares me!” she told Entertainment Tonight in a new interview. “I’m going to be alone with three children a lot. But you know, we’re just going to figure it out. I’m not the first mom to do it, I’m certainly not the last.”

After having two boys, Cavallari and husband Jay Cutler will finally be welcoming a girl to their family.

“Everyone’s really excited. I’m already getting the nursery ready!” Cavallari said. “I didn’t think I would be a big ‘pink’ girl but everything is pink. There’s a chandelier. I’m getting all the pink and purple clothes. I’m just excited to have a little mini me and now I have someone that I can give all of my stuff to, which is great.

Cavallari was recently in the news for defending her former The Hills stars Heidi Montag and Spencer Pratt.