Sometimes you have to know when to call it quits.
[Image via WENN.]
It's the number one song in the country. Now it's about to be the number one video of all time!
And speaking of time, Katy Perry is taking us all the way back to Ancient Egypt!
Now we guess she's the Queen of the Nile!
Ch-ch-check out the video (above) to see Katy's Dark Horse!