白白 + 的 + Noun
The reduplicated adjective 白白 (báibái) is an intensified form of 白 (white), meaning 'pure white' or 'nice and white.' Like other reduplicated adjectives, it conveys a vivid, descriptive quality with an affectionate nuance. It is followed by 的 when used to modify a noun.
她的皮肤白白的,像牛奶一样。
Tā de pífū báibái de, xiàng niúnǎi yíyàng.
Her skin is very fair, like milk.
刚下过雪,地上白白的一片。
Gāng xiàguo xuě, dìshang báibái de yí piàn.
It just snowed, and the ground is all white.
这只小猫的毛白白的,特别可爱。
Zhè zhī xiǎo māo de máo báibái de, tèbié kě'ài.
This little cat's fur is pure white, especially cute.