Megan Fox Transformer

6/18/2010 9:45 AM PDT

Megan Fox -- Transformer

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.