Most people can't afford one Bugatti supercar, worth around $2 million - Floyd Mayweather has 3.

The boxing champ just showed off his insane car collection -- comprised of some of the most rare and expensive cars in the world.

Here's the checklist with approximate market values...

Bugatti Veyron -- $2 million

Bugatti Veyron -- $2 million

Bugatti Grand Sport -- $2 million

Ferrari 458 Spider -- $250k

Ferrari 458 Spider -- $250k

Lamborghini Aventador -- $400k

Porsche 911 Turbo S $180k Ferrari 599 GTB Fiorano -- $300k

Grand total ... $7.3 MILLION.

And unlike Justin Bieber, Mayweather has his own private jet ... and they don't exactly come cheap.

FYI, Mayweather has reportedly made more than $400 MILLION in his career ... and clearly, he ain't afraid to spend it.

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