In these pics, Cameron Diaz and Rachel Bilson are doing the same thing with their hair. Can you guess what it is? Both ladies are practicing Pelusi’s “off-the-scalp” highlighting treatment. Bilson’s dramatic look is due to the large amount of contrast between the hair on her scalp and her tips, while Diaz’s subtler, allowing the ashy brown to fade gently into blonder tips.

As for highlights, Pelusi has the same suggestion for both women. He recommends “lowlights on the scalp area, but not through the ends” in order to preserve the fun contrast already going on.