Allison Williams ’10 is shaking up things at Sterling Cooper Draper Pryce. Or at least its theme song.

In a video posted to YouTube Sunday, Williams, the former Just Add Water and KurtHugoSchneider starlet, belts Nat King Cole’s “Nature Boy” to the song used in “Mad Men’s” opening, “A Beautiful Mine” by RJD2.

According to the video’s description, Williams filmed the shot with director Ralph Arend in one take, without any lip-syncing or cutting.

No matter how big you make it, Allison, we’ll never forget the good old days. But while she’s working in the TV theme song genre, the News has an idea for Williams’ next project.