Spike TV's 'Guys Choice 2015' - Arrivals

Source: Jason LaVeris / Getty

Behold … one of the most rare and expensive cars in the world — a $4.8 MILLION Koenigsegg — and it’s now officially in Floyd Mayweather’s garage.

TMZ Sports broke the story that Floyd was gunning to buy the ultra-exotic lightning fast whip back in June — and now, the deal is closed.

The car is a Koenigsegg CCXR Trevita — one of only two of its kind in the entire world — and goes from 0-60 in 2.9 seconds. It tops out at 250 miles per hour … click here for more details!