Allison Williams

Where you’ve seen her before: If you just thought to yourself that Allison Williams has a striking resemblance to Kate Middleton, she’s already capitalized on it. In 2011, Williams starred as the Duchess of Cambridge in a series of Funny or Die shorts titled, William and Kate: Before Happily Ever After, which she also co-wrote.

Though she’s also had a small role on American Dreams and The League, Williams is most famous for a mildly viral YouTube video of her covering Eden Abhez’s song “Nature Boy,” which she sang over RJD2’s “A Beautiful Mine,” better known as the Mad Men theme song.