Allison Williams, star of the Epix hit show GUH-RUHLS and daughter of news anchor Dan Rather, attracted the eye of casting agents when they stumbled upon a YouTube video of her singing a Mad Men/Nat King Cole mash-up. Unfortunately, that means they also found her slowed down cover of Ke$ha's vomit anthem "Tik Tok." Luckily for Williams, she handles the cover quite capably.

The Ke$ha Cover That Made Allison Williams Famous
[Buzzfeed]