Corsica exist near the upper part of Italy so I believe it inherits quite a bit from the mediterranean. To me, Alizee look Mediterranean vs the more germanic "franks" look that has some nordic viking blood in it (i.e. norseman, northern men, normandy...). I always said she had Mediterranean eyes on a french face. Probably why she makes us all smitten... I was already a sucka for Mediterranean women...
Corsican history does bring up interesting questions about her family tree.