The Broadway vet was noted for choosing bold colors, including scarlet and emerald, in her red-carpet wardrobe.
Others who made the list include actresses Jennifer Aniston, Jessica Alba, Diane Kruger and Zoe Saldana; singers Gwen Stefani and Rihanna; and Prince William's girlfriend, Kate Middleton.
The Best-Dressed issue of People hits newsstands Sept. 17.