Gisele Bündchen Buys $9.1M Mansion, Jiu-Jitsu Pal's Sister-In-Law Is Agent

Gisele Bündchen is expanding her real estate portfolio, plunking down 7 figures for a sprawling Florida property with a soccer field and an equestrian ring ... and her jiu-jitsu pal Joaquim Valente's sister-in-law helped close the deal. According…