Astralshy

I've seen that image before.  Celestia is Bestia.
Hi there, my cosmic friend!
To help promote the new show, the Powerpuff Girls reboot had a crossover with Teen Titans Go! Surprisingly in that show, the Girls acted more like the characters we know. As opposed to the TV show proper, which would often retcon or completely change the girls as we've known them before.

@Samurai Equine

maybe I ve posted it before   ?

Thaaaaaaaaaaaaaaaaaaaaaaaaaaank, my friend

I have one for you two to promote FiM

Ponies do know magic

https://derpibooru.org/images/1190466

@Astral Soul

Thanks for sharing! 
Not sure about you, but I know @Rising Dusk has posted that image of Celestia on one of his status updates as well.