Jennifer Lopez's ginormous wedding rock is as famous as her derriere -- but at "The Back-up Plan" premiere yesterday in Madrid, another big ring caught our attention.
![](https://images.toofab.com/image/45/o/2010/04/27/45c8827a7b9e533681abeb1db763a6e4_md.jpg)
Jenny was rocking a Carla Amorim "Memorial Ring" in white gold with diamonds and moonstone -- and we're told it retails for $5,920!
Always stylish ... right down to her fingertips.