With only 500 examples planned for production, the track-focused McLaren Senna is already an extremely rare supercar, but there's one variant that's even more scarce. Last year, McLaren unveiled the Senna XP (experimental prototype), built by the automaker's Special Operations division to celebrate some of the late Ayrton Senna's greatest achievements in Formula One.

Only three examples were built, each one sold exclusively at McLaren's Beverly Hills dealership. Unsurprisingly, it didn't take long for all three cars to be snapped up, one by none other than well-known rapper and producer Post Malone. Now, the best-selling recording artist is selling his $1.4-million supercar.

Listed for sale by DuPont Registry, this particular McLaren Senna XP is the Master of Monaco Edition, celebrating Ayrton Senna's record-holding six wins at Monaco between 1989 and 1993, five of which were consecutive victories. It features a striking exposed carbon fiber body with red and white accents and a hand-painted Monaco flag on the wing.

The number 12 is also painted on the end plate, in reference to Senna's racing number. Inside, the bucket seats are trimmed in rich red leather, and an emblem resembling the Monaco flag is stitched into the headrests. Red-tinted gloss carbon fiber is also applied to the dashboard and steering wheel, while a one-of-one plaque highlights the car's exclusivity.

Like the regular Senna, the XP version is powered by a 3.9-liter twin-turbo V8 producing 789 horsepower and 590 lb-ft of torque. All that power is sent to the rear wheels through a seven-speed dual-clutch transmission, enabling the Senna to sprint from 0-62 mph in less than three seconds, and power on to a top speed of 208 mph. With only a mere 147 miles on the odometer, this Senna XP has barely been driven; we would hope the next owner will give it a regular workout at the track.

While the McLaren Senna XP's price tag started off hefty at $1.4 million, sources say Post Malone is asking $1.7 million for the exclusive supercar, which actually isn't too terribly great an upcharge.