Kristin Cavallari and Jay Cutler Are Engaged

Jay Cutler, Kristin Cavallari Engaged
Kristin Cavallari and Jay Cutler
Landov; INF

updated 04/26/2011 AT 10:20 AM EDT

originally published 04/25/2011 AT 11:15 PM EDT

Former Laguna Beach star Kristin Cavallari got one sweet surprise while on vacation in Mexico with her NFL beau Jay Cutler.

A source close to the couple confirms to PEOPLE that Cutler proposed over the weekend during their getaway in Cabo San Lucas.

"He surprised her with a quick trip to Cabo to ask her to marry him," the source says.

Cavallari, 24, who also appeared on The Hills, and Cutler, 27, the quarterback for the Chicago Bears, have been dating since last fall.

"I'm in love," she told PEOPLE earlier this year, "and it's been great."

Her rep couldn't be reached for comment.

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