As others have said. You can own pretty much whatever firstnamelastname.com you want and yes, a name like this would have value, but you generally CANNOT use it to profit from the celebrity of whoever that name represents.
People still have a lot of 1998 mentalities about domain names, in spite of the fact that we have a decade of case law that has shored a lot of this stuff up. The domain wild west is over. The matter is settled.
I own firstnamelastname.com of a regionally famous musician who's on a small record label. The reason I bought it is because he's an absolutely epic, world class guitarist and I believe he has a very bright future. For some freakish reason, the squatters who had it before me (they got it right when his first record came out at the age of 21) had let it drop, since he hadn't released a record in quite some time. I actually contacted him and he was totally cool with my dev'ing a fansite. Since that time, we talk from time to time and have kinda become like occasional e-buddies, which is pretty cool!
I told him that I would give him the name at *any time*. Say the word, register the godaddy account and instapush, free of charge. I don't care if he wins a grammy, totally blows up and the name suddenly is worth five figures; it's his if he wants it.
Obviously, this method may not with with a big celebrity surrounded by "handlers" and lawyers who will start a fight at the drop of a hat, but you never know. They can't take it from you if it's unDev'd. The worst they can do is threaten and lie about what the law says, hoping to scare you into handing it over. Best case scenario, you might be able to work something out that benefits you both, either via a sale, or allowing a dev of some kind.
