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The actor transformed his image before filming last year's Twilight instalment New Moon in order to reflect the physical changes of his character Jacob Black.
Discussing the challenge of bulking up, Lautner told Top Of The Pops magazine: "The only reason I did it is because the character required it and I love the character.
"So, in a year from now, if I fall in love with a character that requires me to lose weight, I'm ready to do it."
The 18-year-old has previously confessed that he is wary of being seen as "just a body" following his shirtless scenes in New Moon.
Lautner was recently linked to forthcoming action movie Abduction.
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