Kristin Cavallari and Jay Cutler
04/26/2011 at 10:20 AM 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.