LeAnn Rimes
Check Out My MASSIVE ROCK!
It's a good thing LeAnn Rimes works out -- because the newly engaged singer hit LAX with fiance Eddie Cibrian and she needed all of her strength to carry that GIGANTIC diamond on her finger.

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Eddie popped the question a few days ago -- and if you're keeping score ... the ring is a 5-carat oval diamond set in rose gold fleur-de-lis connected to the band.

Celebrity romance doesn't come cheap.