Simon Cowell looking to sell his Brabus Smart convertible

In the world of celebrity cars, there's been a recent race to see who can acquire the most gargantuan ride, from Arnold Schwarzenegger's military-grade Unimog to the tricked-out full-size vans supposedly replacing the full-size SUV in many famous driveways. Which makes it somewhat refreshing to see a star -- in this case, "X-Factor" host Simon Cowell -- embrace something small, namely a souped-up version of the mini Smart convertible. Or at least, embrace it for a bit, as Cowell's looking to sell his rare ride now.