christina aguilera's blonde/red hair...

Hi I just did my daughters hair in that style. Basically it is a foiling method but bigger chuncks are used. Weave out sections and bleach them out until they are almost white. Then you need to put the red color on,like manic panic. The red needs to be redone every once in a while. The industry give names to styles ( like veiling ) but it is just a foiling technique.... a top salon will know how to do. It is a tricky method and hard to do yourself. good luck!