December 18, 2015 12:55 PM

Jeff Bottari/Getty

There’s a baby on the way for Audrina Patridge.

The 1st Look host and fiancé Corey Bohan are expecting their first child, she announced Friday on social media.

“I finally figured out what to get Corey for Christmas!” she captioned a sponsored photo of herself posing with her Clearblue Confirmed pregnancy test.

“I have some AMAZING news to share with you all! It has been incredibly difficult keeping my mouth shut on this one because all I’ve wanted to do is shout it from the rooftops! But, now that my doctor has given me the OK, it is safe to announce that I’m PREGGERS!!! You guys don’t even understand how hard this was to keep a secret, but my family and close friends did a good job of hiding the news, which made it a little bit easier.”

“It started with me not feeling too well — I didn’t feel sick, but I definitely knew something was off between my mood swings and lack of energy. So, I took the test and TA-DA! I couldn’t even believe my eyes. I called Corey upstairs to make sure I wasn’t just seeing things and, well, let’s just say that he had a permanent smile glued to his face for the rest of the night!”

Patridge, 30, continued, “The difficult thing was that we were going to a dinner party, and I knew I had to keep it a secret, so I told everyone I was on a detox cleanse to cover my lack of alcohol consumption. With the combination of my poor lying skills and Corey’s perma-smile, we were given ‘the look’ over and over again by our friends and family, so it’s safe to say the secret was not a secret much longer!”

She adds, “So far, I haven’t had any morning sickness, I just feel very tired and like I have a major hangover when I wake up, which is a change for me because I’m constantly on-the-go! As far as finding out the sex of the baby… We just want it to be healthy. Girl or boy, we will be ecstatic either way! Corey’s mum wants it to be a surprise, but I don’t know if I’ll be able to wait! I guess we will just have to wait and see. God has a plan for us, and even though it is all happening so fast, I am confident that I’m ready to be a mama!”

Patridge and professional BMX dirt bike rider Bohan, 33, were engaged last month after seven years of dating off and on.

“Corey dropped to his knee and said, ‘We have been together for many years now and I love you more than anything. I want to spend the rest of my life with you – will you marry me?'” the former Hills star told PEOPLE exclusively in November. “I was in shock and kind of didn’t even hear him but I said yes!”

— Sarah Michaud with reporting by Aili Nahas

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