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Kristin Cavallari is one hot mama-to-be!

The former "Hills" star, who's expecting her third child with husband Jay Cutler, took to Instagram to show off her bare baby bump during a friend's bachelorette party weekend in Ojai, California.

Sporting a black bikini top, white bottoms and a brown hat, the expecting celeb put her blossoming belly on display as she stood next to the hotel pool.

“Had the best weekend,” she captioned the sunny snapshot. “Even though I was the first one in bed, it was a blast.”

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She also shared a group shot with the bride-to-be and two other gal pals, where she was seen cradling her bump and making a duck face.

Kristin spilled the news of her pregnancy on her website last month, posting a sweet snapshot with her two little boys, Camden Jack, 2, and Jaxon Wyatt, 13 months.

"We're at it again! Thrilled to announce baby number 3 is on the way! The cutler crew just keeps growin'!" she wrote, holding a heart over her belly.

We can't wait to find out if the couple is having another baby boy or a baby girl! What do you think of her bumpin' bikini pic? Sound off below!

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