Jay Cutler and Kristin Cavallari

Kristin Cavallari and Jay Cutler got engaged while on vacation in Cabo San Lucas, Mexico, People reports.

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The Chicago Bears quarterback's proposal and the trip were surprises to the former star of The Hills and Laguna Beach, a source said.

The couple were first spotted together in the fall and soon after the 24-year-old Cavallari described herself as being "in love" with the 27-year-old Cutler.

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"Things are really good," she said at the time. "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."