I don't know if this counts as a "increased beauty". In episode 12 of "Sin Nanatsu of Taizai" young and innocent Maria becomes the bustier, prettier and older Lucifer (So it can count as AP as well, not sure). Anyways, since the age difference isn't the important thing, and the process is just her hair growing longer... I decided to put it up here:
http://kissanime.ru/Anime/Sin-Nanats...7855&s=default
Minute 18:00 or so