Because there is no music video made by Katy her self.
Yes. You can find it on YouTube under self inflicted Katy Perry official music video
No
Yes, there is a video for it already.
Yep.
firework
it was herself when she was a child... but i'm not sure who plays her...
No there isn't an official video of this song.
Extra Terestrial
yes
12
See the related links section of this question for a link to the official music video for Katy Perry's Hot N Cold.