Reality star Audrina Patridge pregnant

Newly-engaged reality star Audrina Patridge is pregnant with her first child.

The former The Hills regular announced her engagement to BMX rider Corey Bohan less than a month ago (Nov15), and on Friday (18Dec15), she had another surprise to share with fans online.

"I finally figured out what to get Corey for Christmas!" she wrote alongside an Instagram photo of herself holding up a positive pregnancy test. "#babyontheway... (blog post with all the details will be up today, couldn't wait to share the news with you all:)! Xoxo".

The 30-year-old TV personality began dating extreme sports athlete Corey, 33, in 2008, and the couple has enjoyed an on-off relationship over the years.

However, Corey decided to take their relationship to the next level in November (15), when he popped the question to Audrina after dinner at Summit House in Orange County, California.

"Corey pulled it off pretty well," Audrina recalled to People magazine. "Although I noticed he didn't really eat dinner.

"When dessert time came he ordered cheesecake and the waiter brought it out on a platter with a beautiful silver cover. I noticed all the waitresses gathering with phones and thought, 'What is going on?' Then all of a sudden the waiter lifted the silver cover and I saw the ring in a box with white rose petals on the plate.

"Then 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?' I was in shock and kind of didn't even hear him but I said yes!"