From Rihanna's daring fire engine-red mane to Emma Watson's dramatic pixie cut, Hollywood cuties were all about taking risks and switching it up this year. Yahoo! Search has compiled a list of the most searched hair trends, and some of the results will surprise you. Who knew Snooki's poof would generate so much fuss? Find out which stars had the most coveted 'dos of the year on this episode of "The Thread."