REAL marketing: getting celebrities to retweet you

I have a website with a twitter account that is quickly gaining momentum. We have two (that I know of) twitter followers, and I'd like to be able to search our 2k+ followers list for other celebrities for possible communication and collaboration.

How can I search my own followers for other celebrities?

(http://www.twitter.com/thathigh) - lindsay lohan and sarah silverman...ha