Floyd Mayweather -- Drops $3.5 Million On ANOTHER Supercar

Another day, another ridiculously expensive purchase ... this time, Floyd Mayweather dropped $3.5 mil on a lightning fast Bugatti ... putting his car collection over $19 million.

We spoke with Floyd's car guy Obi Okeke at Fusion Luxury Motors who confirmed the 2015 Bugatti Veyron Grand Sport Vitesse was delivered to Mayweather in Miami Monday.

"Floyd called me up and told me he wants to broker this Bugatti deal so I flew out to Miami on Saturday to work the deal and we just got it done."

"The Bugatti is brand new 2015 and the last one for sale in the world."