Taylor Swift and Kendrick Lamar Mash-Up Hits the Web

"Shake It Off" and "Backstreet Freestyle" go together pretty well! Who knew?

— -- When Taylor Swift's album "1989" sold 1.287 million records in its first week, she celebrated by lip syncing the Kendrick Lamar rap, "Backstreet Freestyle."

Now, a mash-up of the song mixed with her hit, "Shake It Off" has hit the web. (Listen to it here, but note that there is some explicit language.)

It's been a big week for Swift, as her video for "Blank Space" was released just two days ago. In the video, Swift, 24, plays a crazed ex-girlfriend, which video director Joseph Kahn told Mashable was a take on the singer's much-discussed dating history.

"She's aware of this. She's not an idiot," he said. "Taylor wanted to make a video addressing this concept of, if she has so many boys breaking up with her maybe the problem isn't the boy. Maybe the problem is her."