Friday morning, Nick Lachey will unveil a tiny, bejeweled car to celebrate the 40th anniversary of Hot Wheels. The 18-karat white gold "toy" features more than 2,600 diamonds, and it will be auctioned off for Big Brothers, Big Sisters. Better be careful when putting it through the little car wash — or making it do the loop-de-loop — or playing demolition derby. Isn't that what you did with Hot Wheels as a kid? Anyway, not sure why they chose Lachey to "unveil" this blinged-out car in a publicity stunt: Maybe because it's cheesy, and they're playing to his strengths? [Marketing Daily]