Jennifer Lopez Performs ... To Drunken Crowd?

7/19/2011 12:00 PM PDT

Jennifer Lopez Performs ... To Drunken Crowd?

Jennifer Lopez is set to perform at a Ukrainian wedding in 3 hours ... but here's the problem -- she doesn't hit the stage until 11:30, and you know how the Ukrainians like their vodka.

Jennifer is reportedly pocketing a million bucks for her performance.  Our wedding spies tell us there are roughly 300 people attending the bash.

A source connected to Jennifer calls the performance time "a little weird," but hey, drunk or not, a million bucks is a million bucks.

Fun fact ... the World Health Organization has rated the Ukraine as #1 in the world for alcohol consumption among youth.

BTW, the money Jennifer makes is hers and hers alone, since she's already separated from Marc Anthony.