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.