Kristin Cavallari and Jay Cutler Are Engaged

Kristin Cavallari, Jay Cutler - "Source Code" - Los Angeles Premiere - 2011
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The quarterback proposed to "The Hills" star during a weekend vacation in Mexico.

MTV reality star Kristin Cavallari is engaged, according to multiple reports.

Chicago Bears quarterback Jay Cutler proposed to the Laguna Beach and The Hills actress as they vacationed in Mexico over the weekend.

"He surprised her with a quick trip to Cabo [San Lucas] to ask her to marry him," the source tells People magazine.

The two have been dating since last fall.

Her rep could not be reached for comment.