Rarity, the famous fashionista, has been requested by princess Celestia to tailor a new set of regal dresses.
She could have requested it in private, since they have a friendly relationship being an element bearer, but the official, public announcement filled her with joy and pride.
She goes to the familiar castle with the idea of exceeding any expectations Celestia might have, both as a thank you and to show her professionalism and talent.
However, seeing the princess in a more private manner is making her realize just how much the word goddess fits her.
And Celestia will miss no chance to prove it to her loyal subject.

My third entry for Dirty little secret´s little dirty contest

Art stolen from Raffles18