The actress paired her sheer black gown with a wig for her walk down the red carpet ... "Karl Lagerfeld: A Line of Beauty," and dress code. Chastain, 46, opted for a tiered black strapless gown ...

Emilie Kouatchou, the first Black actress to play Christine Daaé in Broadway ... me in that costume and me wearing that wig and me singing those songs and just my face as a face of Phantom ...