Lauren Sanchez Rocking Double the Diamonds on Ring Fingers on Wedding Day

Lauren Sanchez is showing off major BLING before her star-studded wedding to Jeff Bezos Friday in Venice, Italy ... we're seeing a close-up shot of her flashing two giant rocks on her digits.

The bride-to-be was photographed in Venice today with gigantic diamond rings on both her ring fingers. One appears to be a pillow-cut, the other -- on THAT finger -- is an oval the size of an egg.

As you know, the impending nuptials have brought out a galaxy of stars and celebrities.