14) Jared Leto
Jared Leto is dramatic enough in his own right, from the brooding heartthrob on My So-Called Life to Oscar-winning actor and thirty-first-frontman of Thirty Seconds to Mars - but it's rivalled by his transformation for film. He's gained and lost a significant amount of weight for most of his roles.
The transformation with Leto makes one realise just how committed he is to his work and how well he has been able to reinvent himself time and again, musically as well as in his acting career.
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Edited by Mudeet Arora