Rumor is that Jay Z is cheating on Beyonce with this girl...and she ain't even that cute, at least compared to Beyonce!

Allegedly Jay Z hooks up with this girl named Casey Cohen, a VIP host at 1OAK in NYC. Reports say Jay Z sees Casey about twice a month. 

I don't know if I believe this. Do you? Plus, is Beyonce dumb enough to stay with a cheater? Maybe this is why Beyonce's sister, Solange, hates Jay Z??

Click here for more details on the story. Below are pictures of Casey.