Rihanna -- Chris Brown Jokes Are Funny

Posted May 5th 2009 1:22PM by TMZ Staff

Rihanna & Jay-Z have a similar sense of humor -- because last night in NY we asked RiRi the same question Jigga cracked up at a few nights back: Is Chris Brown responsible for the Swine Flu pandemic?

We're 99.8% sure it's her you hear chuckling after.

Also hilarious: Her outfit.