Happened to one chick I knew. 4th-5th grade, she was ugly as sin. Covered her face with her hair, and all that, sorta pudgy, always wore transitions shades which were almost always tinted somehow.
6th grade, started putting her hair back.
7th-8th grade, wore generic slut clothing and makeup etc. turned hot overnight.
Same with almost all of the nerdy chicks I knew. They turned into hot sluts overnight. There's still like 2-3 that are still ugly and can't be saved.