There are 3 books in the Airhead series. The newest book is Runaway which came out in 2010.

1
Airhead

Book cover of Airhead

Two worlds collide when super-gorgeous celebutante Nikki and tomboy brainiac Em find themselves thrown together - literally. Forced to live the life of a glamorous supermodel, will Em be able to keep her old life, and those she cares about, a secret?

Airhead is the first in a brilliant, funny…

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2
Being Nikki

Book cover of Being Nikki

Teen-supermodel Nikki Howard has a secret. She's not the gorgeous golden airhead she seems - on the inside she's someone else. Literally. Em Watts is stuck in the body of glamazon celebutante Nikki. And it's not easy. Especially when Nikki's past is about to catch up with her, her boss…

3
Runaway

Book cover of Runaway
Emerson Watts is on the run: from school, from her family and from herself. She's reeling from the shock that Nikki, the girl whose body her brain was forced to inhabit, is still alive. And she's furious. Manipulative Brandon plans to use Em to discover a secret that will ensure…