Lauren Conrad is celebrating her son's first birthday.

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The 32-year-old former "The Hills" and "Laguna Beach" star marked the milestone by throwing a party for Liam, her son with husband William Tell, on Saturday.

Conrad shared a photo on Instagram of Liam digging into his birthday cake. Decorative streamers and a banner reading "Happy Birthday Liam" can be seen in the snapshot.

"Celebrated our sweet Liam's birthday today," Conrad captioned the post.

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Conrad dedicated a sweet post to Liam on his official birthday Thursday, July 5.

"Celebrating 1 year with our little guy," she wrote. "Happy Birthday Liam!!"

Conrad said in an interview with People in September that Liam is growing up quickly.

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"I think that you can become a little overwhelmed, just being at home with your baby all day," the star said.

"But seeing how fast they chance, you realize it's so important not to miss anything."

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"It's been great!" she added of motherhood.

"Honestly, it's exactly as everyone describes it. It's the best and hardest thing you'll ever do."

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