I wouldn't trust anyone who says they are a celebrity, online.
More than likely, if you have someone on your friendlist who claims to be one, they're not.
It's rare when a celeb actually comes out in public and says it. Dane Cook did it several years ago, on a TV interview, and his friendlist was filled-up in no time.
djackson10 is not desean jackson's, and another thing:1-most ids you will ever see are fake,2-if not fake, their friends list is full, trust me ive tried it, and 3- if they aren't full, they probably won't add you cause they don't play ps3 very often