When Paris Hilton isn't busy spewing homophobic comments in taxis, she's driving ridiculously expensive cars. Recently, though, she took the passenger's seat and let her 21-year-old boyfriend River Viiperi (Paris is 31) take the wheel. And although you think it might be a bad idea for Paris to be behind the wheel of a car that costs $350,000, she's probably pretty damn good at it by now. After all, before the LFA, she's had a Bentley, a Ferrari, and an SLR McLaren. Letting this little kid drive seems like a recipe for speed-thirsty disaster.