Does that mean one of this year's nominees? Because no body really jumps out. If she's notorious, that means she's been around for a while and is someone the designers send dresses to.
Lead Actress: Cate, Marion, Laura Linney, Ellen, and Julie Christie
Supporting: Cate, Amy Ryan, Ruby Dee, Saiorse Ronan, Tilda
I guess Cate and Laura fit those criteria best, but I'd be surprised if it's either of them.
If it could be a nominated actress from another year, then who knows.