Conrad had shared her baby news New Year's Day by posting a picture of her sonogram. The post received over 800,000 likes on Instagram.
"Happy New Year! I have a feeling 2017 is going to be the best year yet..." she wrote at the time.
Conrad and Tell, a 36-year-old musician and former rhythm guitarist for Something Corporate, married in 2014 after two years of dating.
Conrad couldn't help but gush about her husband in a blog post the next year.
"My favorite thing about being married is knowing that I have a partner in life that I get to do so many wonderful things with. Dreaming of the things we will do 20 years from now is so fun," she wrote in August 2015.
"[I'm thinking] maybe two [kids]... That way we aren't outnumbered," she said.
Conrad came to fame on the MTV series "Laguna Beach" and "The Hills," and has since launched her own fashion and lifestyle collection.
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