Watch The Audition Tapes That Made Celebrities Famous

It only takes one special role to launch a career on the A-list.

Landing that role though, that's the hard part. If you want to be somebody in Hollywood, you have to nail your audition.

These stars did just that, and their lives haven't been the same since.

Megan Fox auditions for her leading role in Michael Bay's 'Transformers,' the blockbuster hit of 2007.

Here's Emma Stone auditioning for 'Easy A,' which followed her movie debut in 'Superbad.'

Natalie Portman was only 11 years old when she auditioned for the R-rated movie, 'Leon: The Professional.'

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