By Deirdre Durkan
April 02, 2019 at 02:19 PM EDT
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Congratulations are in order for Lauren Conrad and William Tell!

The Hills alum, 33, announced on Tuesday that she and her musician husband are expecting their second child together, sharing a side photo of her baby bump under a floral-patterned dress.

Larry Busacca/Getty Images

“It’s been hard to keep this one to myself! Very excited to share that our family will be getting a little bigger this year 👶🏼,” she captioned the shot.

Conrad and Tell, 39, welcomed their first child, a son named Liam James, on July 5, 2017, after the co-founder of The Little Market and her lawyer husband tied the knot in a September 2014 sunset ceremony at a boutique winery.

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The family of three have been steadily creating their own traditions as their son gets older, and are great at sharing their picture-perfect escapades on Instagram.

On Liam’s first birthday, Conrad shared a picture of the trio looking on the beach, as she and Tell looked down at little Liam and their son peered down at the sand.

This past October, Conrad went all out for Halloween, dressing as Melanie Daniels from The Birds and Liam in the cutest homemade bird costume.

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During her first pregnancy, the couple opted to find out the sex of their baby before he was born for a very straightforward reason.

“I don’t really love surprises,” Conrad explained to PEOPLE at the time. “I like to have all the information. And I was sharing my body with someone — so I wanted to know as much as possible about him.”

“I always hoped I would have a boy,” she adds. “Boys are so fun. I was a tomboy, and I always play best with boys. When we found out, I was so excited.”

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Before she met Tell, the proud mama admitted she was open to not having children.

“In my early 20s I was open to having them or not having them. But after meeting William, I changed my mind,” she previously told PEOPLE. “I knew I wanted to have a family with him. But I didn’t want to do it right away.”

“I’m crazy about Liam, but I never really got baby fever,” Conrad added. “We wanted to enjoy being married and to really be in the right space. We took our time, so it was something to look forward to.”

Right after her son’s arrival, Conrad revealed she didn’t feel “any pressure” to lose the baby weight and was thankful for her special routine with her newborn.

“His last nighttime feeding is right around when the sun comes up, so I sit and feed him and watch the sun rise,” she told PEOPLE. “He’s funny to watch — he makes really funny little expressions. I’m already stressing out because I want him to stay this tiny and I know he won’t. So I’m just trying to enjoy how itty-bitty he is.”

The designer and author has been great about sharing her love for finger paints and movies with Liam and knew she always wanted to teach him “to be strong” and “respect women.”

And Conrad previously hinted at wanting to expand her family further in 2017, saying, “I was looking at him the other day, and I was like, ‘I understand now why people keep having babies!’ We’ll probably have two. I think it’s best not to be outnumbered.”