Damnnnnnnnnnnn! Read on: Hot damn! Just when we thought the Wade divorce was cooling off a bit, Siohvaughn went and turned it all the way up. Dwyane Wade 's ex-wife Siohvaughn Wade filed a shocking (well, not to us) lawsuit today in Chicago. And it's against her ex's mistress Gabrielle Union ! Gabby and Dwyane tried to keep their relationship under wrap for a while, but have recently gotten…