Steven Tyler, has a Hennessey Venom Spyder, and is auctioning it for charity this Friday (Jan 20th 2016)

The 1,451-horsepower twin-turbo V8 sold for 1.3 million USD new, and is one of only 12 to Venom to exist, but the only convertible

Janie's Fund aims "to bring hope and healing for many of our country's most vulnerable girls who have suffered the trauma of abuse and neglect."

When “Janie’s Got a Gun” – which touched on the theme of child abuse – was released in 1989, Tyler was overwhelmed and inspired by the thousands of letters he received from his fans – fans who had experienced neglect and abuse themselves. It prompted him to launch Janie’s Fund – a program to support girls who have been abused and neglected, giving them the resources they need to heal and, as Tyler puts it, “the tools they need to get on in this crazy world that we’ve got.”

http://www.barrett-jackson.com/Events/Event/Details/2012-HENNESSEY-VENOM-GT-SPYDER-STEVEN-TYLERS-198096

(updated info thanks to Marc!)

As bidding soared past a half-million dollars, the rock-and-roll legend took the microphone to add a few extra perks to the bid package: a weeklong stay at his mansion in Maui and a guitar signed by every member of the Aerosmith band. The crowd roared in excitement as the bidding war escalated.

http://www.azcentral.com/story/news/local/scottsdale/2017/01/20/steven-tyler-super-car-raises-800k-charity-barrett-jackson/96163172/