A lot has changed for Megan Fox since first appearing in "Transformers" three years ago.
Here's 21-year-old Meg back in 2007 (left) -- and just three years later, the stunning 24-year-old at her "Jonah Hex" premiere last night (right).
It's amazing what success can do for a gal.
6/18/2010 9:45 AM PDT BY TMZ STAFF
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