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She was infamous for her crazy single life on “The Hills,” but Kristin Cavallari has settled down since those days.

The reality TV star began dating Chicago Bears quarterback Jay Cutler back in August, and over the weekend she told People Magazine, “I’m in love.”

The gossip mag caught up with Kristin while she was celebrating her 24th birthday at Las Vegas’s The Bank Nightclub.

"Things are really good," Cavallari continued. "I'm just enjoying my personal life and taking a little time away from the public eye, which is why Chicago is great for me. My mom and that whole side of the family is there. And Jay is there. It's nice to be able to hang out with my mom, and, you know, I'm in love and it's been great."

Although Jay could not attend the party, he did show Cavallari that he was thinking about her by sending a large bouquet of pink flowers to her VIP table.

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Making for quite the fun-filled belated bash, Kristin Cavallari hosted a birthday fete at Bellagio Resort and Casino in Las Vegas on Saturday night (January 15).

Looking oh-so-sexy, the former "Hills" hottie (who turned 24 of Jan. 5) worked the arrivals area at The Bank nightclub venue before heading inside to be doted with a birthday cake in between drinks and dancing.

Making the trip to Sin City just hours before party time, Miss Cavallari tweeted prior to the excursion, "Already a hectic morning...here we come vegas!"

Meanwhile, Kristin will surely be focused on today's NFL divisional playoff - as boyfriend Jay Cutler leads his Chicago Bears against the Seattle Seahawks.

Tweeting this morning, Cavallari lovingly wrote, ""I love JC will all my Heart"

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