You know what they say: Friends who walk in all the major runway shows and undergo complete beauty transformations together, stay together.

OK, that might only be the case for Kendall Jenner and Gigi Hadid , fashion's favorite it-girl-best-friend-power-duo. For their latest jaunt down the runway together, at Balmain in Paris Thursday, the pair appeared like never before: wearing wigs in each other's signature hair color.