Lauren Conrad flaunted her growing baby bump during a tropical vacation on Thursday.

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The 31-year-old designer and former "The Hills" star showed off her bare belly while "babymooning" ahead of the birth of her first child with husband William Tell.

"Babymooning and pretending my blended lemonade is a frozen margarita," she captioned a photo on Instagram of herself at the beach.

"The Hills" alum debuted her baby bump in mid-January after announcing her pregnancy on New Year's Day. She and Tell, a 37-year-old musician and former member of Something Corporate, married in 2014.

"Happy New Year! I have a feeling 2017 is going to be the best year yet..." the star wrote Jan. 1.

Conrad's former "The Hills" co-star Whitney Port is also pregnant and expecting her first child with husband Tim Rosenman.

Fellow alum Audrina Patridge, who is mom to 9-month-old daughter Kirra, discussed the pair with E! News in February.

"Finally! The five main 'Hills' girls are all married or pregnant or moms," she said of herself, Conrad, Port, Kristin Cavallari and Heidi Montag.

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"It's awesome," the star added. "I congratulated Whitney. And Lauren, she's going to be such a good mom. I'm really happy for them. Being a mom is the best thing in the world, so I'm really excited for them."

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