Audrina Patridge Explains Why She Didn't Invite Any of Her 'Hills' Co-Stars to Her Wedding

Fit Pregnancy and Baby

Audrina Patridge couldn't be happier, and her smile says it all!

The glowing reality star -- who is expecting her first child, a baby girl, with fiancé Corey Bohan -- is the cover girl for Fit Pregnancy and Baby's July issue, and in her interview with the magazine she gets candid on her pregnancy, wedding and life after The Hills.

WATCH: Audrina Patridge 'Dumped' Fiance Corey Bohan to Get Him Off 'The Hills'

"My entire life has changed in a year," the 31-year-old mom-to-be dishes. "Five years ago, I wouldn't have been ready. I was filming constantly and living a very selfish lifestyle. But I got all that out of the way, and now I'm ready for the next step."

Fit Pregnancy and Baby

The brunette beauty confesses that she and Bohan weren't trying to have a baby -- "it just happened!" -- but they are beyond happy with "God's timing."

"I just felt tired and bloated and I started breaking out, which I never do. I told Corey, 'Something is wrong with me,' and he's like, 'You're just being dramatic,'" she explains. "So, I took a pregnancy test, and when I saw the result, I called him upstairs. I said, 'Oh, my God, am I seeing things?' He just got this big smile."

Patridge says that once she found out she was pregnant, she anticipated the worst. Luckily, that hasn't been the case.

WATCH: 'The Hills' Cast Reveal the Reality Show's 7 Fakest Storylines

"I thought, 'I'm going to get morning sickness. My back will hurt. My rings won't fit.' I was ready for anything, but none of it happened," she spills. "I'm glowing and happy. There were three or four days during my first trimester when I could not get out of bed and all I wanted to do was sleep. But overall, I'm feeling good! Watching my body transform has been amazing. I feel like a woman now."

Fit Pregnancy and Baby

Patridge tells the glossy that the best part of her pregnancy thus far is feeling the baby kick.

"She already has a personality. I can poke her, and she'll kick back," Patridge adorably reveals. "Last night, Corey and I were watching my stomach move while I was lying down. It freaked him out. He was like, 'Dude, maybe you should stand up!'"

She's also looking forward to saying "I do" to her professional BMX rider beau in November. Patridge admits, however, that planning a ceremony while pregnant hasn't exactly been easy.

PHOTOS: Audrina Patridge Shows Off Growing 'Alien' Baby Bump In Hawaii

"It's a little overwhelming. I haven't found a dress yet, because I can't try them on," she explains. "I've gained weight mostly in my thighs and butt, and my boobs are suddenly giant. After I have the baby, I have no idea what size my breasts will be or if my hips will go down or get bigger. So for now dress shopping, at least, is on hold."

Fit Pregnancy and Baby

One thing she has been able to finalize is the guest list, which consists of approximately 130 people, "mostly family." But will her Hills co-stars be attending?

"As far as friends go, we only invited the ones who've been there for us in the past year and who will continue to be there for us for the next 30," she says. "So, no one from The Hills made the cut. If we were doing a really big wedding, I'd invite them, but we're keeping it intimate."

WATCH: Inside Audrina Patridge's Super Cute Baby Shower!

Patridge and Bohan originally planned to tie the knot much sooner, but once they found out they were expecting, they decided to postpone their nuptials.

"I didn't want to rush getting married, because stress is bad for the baby," Patridge explains. "I was a little worried about people judging me for it, but Corey wasn't. He said, 'Stop caring what people think. Their opinions don't matter.' Anyway, we've already been together for so long, it’s like we're already married. It's just a title at this point -- and a ring."

Once the two make it official, they plan on taking a honeymoon, with their newborn by their side! "We're definitely bringing her -- and my little sister, so she can watch the baby while we go out to dinner or snorkel," Patridge says. "I'm so lucky I'm so close to my family. If I had to hire a stranger to babysit, I'd probably freak out."

WATCH: What 'The Hills' Cast Looks Like 10 Years Later!

Last month, ET celebrated the 10th anniversary of the MTV reality series that made Patridge famous with our own version of 'Hills Week.'

Watch the video below to see what Patridge's co-stars look like one decade later!