She's a brainiac trapped in the body of an airhead.

Teenagers Emerson Watts and Nikki Howard have nothing in common.

Em's a tomboy-braniac who couldn't care less about her looks.

Nikki's a stunning supermodel: the world's most famous airhead.

But a freak accident causes the girls' lives to collide in the most extraordinary way - and suddenly Em knows more about Nikki's life than the paparazzi ever has!