The Justin Bieber wannabe version:
(The intro is painful. Be warned.)
The slower, calmer version:
The inspirational hospital version:
I'll confess...I hardly ever listen to the radio anymore. Which means that I hadn't heard Katy Perry's latest song until a week or two ago. (Not a tragic thing, really. Albeit, I do like the song.) After looking through a few videos, I think the hospital version definitely tops all of the others. Enjoy!