The Mille Miglia is one of the most classic races on earth. Back in the day, the best drivers in the world drove the fastest cars through countless Italian villages in a 1,000 mile test of man and machine. These days it's a vintage race, with many of the exact cars that competed decades ago still racing. For this year's event, Jaguar's letting a bunch of celebrities take the helm of some of their most classic cars, from ex-Formula One drivers to AC/DC frontman Brian Johnson to car and chin-enthusiast Jay Leno. They took off this morning, and will be racing until the 18th.