Xià Dá is a 28 year-old Chinese manhua (comic book) artist. Japan has just fallen in love with her.
Her work has been translated into Japanese and is being serialized in Japanese manga Ultra Jump. While she certainly does appear to have comic chops, that's probably not why her photos are rampaging through the Japanese internet.
She appeared on the cover of a Chinese PSP magazine. Photos in the gallery, samples of her work, too.