Here are the details from The Insider:
-BEYONCÉ's dressing room is set up in gym with a vanity and flowers.
-There are security everywhere inside ... they swept the place.
-Fridge stocked with JAY-Z's favorite champagne.
-There was a platform - maybe for the ceremony.
-Tables were set for about 30, so the event will be intimate.
Perez Hilton posted the address of the wedding.