Kristin Cavallari Turns 25 in Chicago with Fiancé Jay Cutler

01/07/2012 at 03:35 PM EST

Kristin Cavallari 25th Birthday Spent with Jay Cutler
Kristin Cavallari and Jay Cutler
Charlie Luciano/Startraks
On The Hills, Kristin Cavallari was often seen partying the night away at an L.A. hotspot – but when it came to turning 25 on Thursday, the reality star enjoyed a more mellow celebration.

Cavallari marked the milestone with a small group of close pals and fiancé Jay Cutler in Chicago, a source tells PEOPLE of the celebration, which included a trip to the Shedd Aquarium and dinner at a Mexican restaurant.

"They had a great time," the source says. "Kristin really enjoyed her low-key birthday festivities."





And even though it seems like Cavallari had it all, there's one thing that only her new age could bring.

"25 means u can rent a car," the former Dancing with the Stars contestant Tweeted the day after her birthday outing. "Oh heck yes."

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