LeAnn Rimes showed off her diamond engagement ring Tuesday morning--just one day after announcing her engagement--at Los Angeles International Airport, where she and fiance Eddie Cibrian were preparing to depart for Cabo San Lucas, Mexico.

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The ring is reportedly a platinum sparkler with a 5-carat oval diamond set in rose gold fleur-de-lis.

LeAnn made no secret of their destination, Tweeting, "Cabo!!!!! Sun, bikinis, friends, food, tequila...celebration!!!! Gonna be the best trip!!

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