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Kristin Cavallari

Stephen Lovekin/Getty Images

Happy birthday, Kristin Cavallari!

The mother of three turns 29 today, and as a source tells E! News exclusively, she'll be celebrating with her family and friends all day long.

So far, the former Hills star turned fashion designer has been spending quality time with sons Camden (3) and Jaxon (18 months) and her and Jay Cutler's first daughter Saylor (1 month). Kristin plans to have a special B-Day lunch with her mom, a source tells E! News, and is having a small, intimate dinner with Jay and a few close friends tonight.

Kristin Cavallari, Jay Cutler


A source tells E! News Kristin is in happy spirits today, which as the birthday girl, she certainly should be. She deserves a good B-Day, too, given her 2015. It was quite a roller coaster year, and in the span of just a few weeks, Kristin welcomed her third child but also tragically lost her brother, Michael Cavallari.

On New Year's Eve, Kristin had a date night out with Jay and reflected on the major ups and downs of the past year. She Instagrammed a photo of the couple toasting. "2015 brought my sweet, baby girl but it also took my brother's life," she wrote. "Hoping for no extreme highs and lows this year. Happy new year, everyone."

Let's hope happy things are in store for Kristin's 2016 and her 29th year. Happy birthday!