None. Celebrities cost ridiculous amounts of money that could be better spent increasing the size of the dialogue system as a whole (or ensuring that more than 10 voice actors do the voices for 10 races w/ male/female distinctions).
I agree completely.
Be gone, celebrities!Besides, being a celebrity doesn't make you an amazing voice actor. Just as in movies, some of the best actors/actresses I've seen were considered "no-names," whereas some of the worst I've seen
were celebrities. Bethesda could hire some really talented people, who aren't celebrities, and do just as well (or better) than if they hired celebrities, and they could afford to hire a lot more as well.