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Cavallari is expecting her first child later this year with football player fiance Jay Cutler.
The 25-year-old mom-to-be told Us Weekly, "[My jeans] aren't buttoning anymore… so I have this thing called the Belly Band that just goes around the top of your jeans so you can wear them without buttoning them. It's the first time I've had sample size dresses not fit me. It's all for a good reason. It's all right. I'm pregnant."