I believe its 2 parts hennessy one part alize, or the other way around according to tupac 
I've always offered people money to go up and actually order one with a straight face at a crowded bar, but never had any takers.
I love Alize, tastes great and the hangover isn't bad. But I tend to just order jaeger or vodka/red bull in bars - they look at you like you're ghetto if you order alize.
thugz passion - You can make it with champagne as well, doesn't have to be cristal. Hennesey is some foul shit.