if authors count then i've met a couple famous people, yeah. i met ellen hopkins and i was nervous as psyduck, but i managed to keep a conversation somewhat. i also met charles benoit (three times), suzanne collins, and i saw laurie halse anderson from a distance i think.
other than that, i haven't met anyone super famous. i met all these authors at this reading festival in NY where i used to live. i met charles benoit the first time at my old high school i went to in 9th grade, and then i also met him again at a writing group and got his signature..on a napkin..and then got an actual book signature from him at the festival. it was lit.