Fans were more than excited to have the "Rolling in the Deep" singer deliver a rare performance at this weekend's X-Factor U.K. finale. What they weren't expecting, however, was a dramatic new haircut to take center stage at Wembley Stadium. While performing her hit single "Hello" in Harry Winston Diamonds, the 27-year-old showed off her shorter style with a little less curls and a lot shorter length. Adele's latest appearance comes one day before her concert special will air on NBC. While the show was taped before her dramatic haircut, viewers can still expect some powerful performances from the Grammy winner