LeAnn Rimes Check Out My MASSIVE ROCK!

12/28/2010 4:38 PM PST

LeAnn Rimes' Engagement Ring -- 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.

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.