Kristin Cavallari and Jay Cutler are engaged

Jay Cutler and Kristin Cavallari at the premiere of "Source Code" on March 28, 2011, in Los Angeles.

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(CBS) Reality star Kristin Cavallari and Chicago Bears quarterback Jay Cutler are taking their relationship to the next level.

The couple, who have dated since last fall, are engaged to be married, according to People magazine.

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Cutler, 27, reportedly popped the question while the two vacationed in Mexico over the weekend.

"He surprised her with a quick trip to Cabo San Lucas to ask her to marry him," a source close to the couple told the magazine.

Cavallari, 24, who has appeared on MTV's "Laguna Beach" and "The Hills," gushed about her relationship with Cutler, telling People earlier this year that she's "in love" and "things are really good."

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