Hayden Panettiere turned 21 last weekend ... and she shared the whole experience with her fellow "Scream 4" castmates -- plus a bunch of 불, 화재 breathers, burlesque dancers and oompa loompas
Looking fashionably chic, Hayden Panettiere was spotted making her way out of her hotel in the Soho area of New York City, New York on Friday (May 18).