Jay Leno Puts Kim Kardashian's 20.5 Carat Ring to the Test

The Tonight Show host grills the newly engaged reality star, and she admits she and Kris Humphries have a prenup!

JAY LENO GRILLS KIM KARDASHIAN ABOUT HER NEW FIANCE AND 20 CARAT ROCK...

THE TONIGHT SHOW HOST WAS ACTING VERY PROTECTIVE OF KIM TUESDAY NIGHT WHEN SHE TOLD HIM ABOUT HER ENGAGEMENT TO KRIS HUMPHRIES

BUT JAY STILL WANTED TO MAKE SURE KRIS AND HER ROCK WERE THE REAL DEAL

WHAT'S THE MATTER JAY? AFRAID IT MIGHT BE A FAKE? AFTER THE SHOW, KIM TWEETED