Sexy Nurse Halloween Costume: Celebrities as Naughty Nurses. Want to be a naughty nurse in Halloween 2014? Go ahead and buy yourself a sexy nurse uniform. It is a Halloween costume that will never go out of style. To borrow the words of our friend Koosi, it is one of those costumes that is classic but, at the same time, will forever be current. No wonder Hollywood celebrities, like singing superstar Christina Aguilera, dress as nurses when they want to bring the sexy.