8. Hermoine Granger (Emma Watson) in 'Harry Potter and the Goblet of Fire'

While Ron gets saddled with the world's worst tux (there are ruffles), Hermione makes a stunningly posh date for the Yule Ball. Her perpetually bushy hair is up, the trainers and hoodies replaced with heels and a lovely pink gown. She even gets to make the classic makeover entrance -- at the top of a staircase as everyone looks on in amazement.