Sorry, I don't have a picture for you, but I have some advice. Those black streaks were probably clip in extensions like the ones made by Manic Panic. You really don't want to put black dye on your hair when the rest of it is platinum blonde - if you change your mind and want to go straight blonde, that black dye can be literally impossible to fully remove and you could be stuck with dull orange streaks. I speak from experience. This way you can take any picture of Aguilera's hair for blonde reference, or simply tell the colorist that you want a snowy platinum blonde with no trace of warmth.