Wedding bells are ringing Saturday for Dwyane Wade and Gabrielle Union.


The duo being super secret about tomorrow's big day with a contract demanding guests be totally silent about what they see at the ceremony and party.


TMZ says relatives, guests and vendors have to sign a confidentiality agreement before setting foot in the wedding.


Violators nabbed gabbing about the affair will have to pay a fine.

Christopher Polk 2013 Getty Images