The Hills alum Audrina Patridge is officially a mom to be! The reality star announced on Instagram on Friday that she and fiancé Corey Bohan are expecting their first child together.

"I finally figured out what to get Corey for Christmas! #babyontheway #ClearblueConfirmed #ad (new blog post up with the exciting news!) xo," she writes.

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Bohan and Patridge have been dating on and off for seven years but confirmed they were engaged last month. Patridge also talked to UsWeekly about her exciting baby news and says she's definitely ready for that next step in her life.

"I asked [Corey] to have a look at the test and make sure I wasn't seeing things. You never really expect it to say 'Pregnant.' He had a big smirk on his face and was really happy about it," she tells the magazine. "I feel at this point in my life I am ready to be a mama!"

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Patridge will be keeping fans and the Internet updated on her pregnancy as she goes along with her blog, The Inside Out. The socialite says that she's already starting to see changes in her body.

"So far, my bra has just gone up a size!" she says. "I still work out and go about my normal routine. I just get tired easily."