McAdams showed up with a sleek, platinum bob and wearing a deep-blue David Koma dress. Her date? Sister and makeup artist Kayleen McAdams Of course, going from dirty-blond to platinum is an easier process than, say, jet-black to platinum, but it's dramatic nonetheless. It's par for the course for McAdams. The actress' breakout role in The Notebook showed her as a brunette, she was blond in Mean Girls, had a dramatic ombré in True Detective, and even dabbled with strawberry-red hair in 2005. But this platinum? It might be our favorite.What do you think of her new look? Let us know in the comments.