quite a few. my dad was a diplomat and now i am one too so quite a few heads of state, prime ministers, kofi annan, the dalai lama, rigoberta menchú (nobel peace prize laureate).
i didn't meet her but i saw audrey hepburn in person when i was 11 and she was still goodwill ambassador at the UN, this was not long before she died. i'll never forget that. she was very captivating and beautiful, even at her age.
lots of famous people live in geneva. i met phil collins when he moved to our little village outside the city when i was a teenager and i'd run into him at the bakery or riding a bike with his much younger now ex-wife.
i've met a few tennis players - marc rosset, roger federer, marat safin, nicolas lapentti.
there's more but i'm drawing a blank...