Description from alt text:

A digital illustration of Princess Celestia from My Little Pony Friendship is Magic. Celestia is a white alicorn pony with rainbow hair, happily holding a plate with a piece of birthday cake on it in her hoof. She has a party hat on her head. On the table with her is a birthday present and an opened birthday card, and behind her are more gifts and an array of balloons. Text at the top of the image reads Happy Birthday! Text on the table says @sparkytopia with a heart.

Description from DeviantArt:

Happy Birthday from Princess Celestia! a little demo featuring everyone's favorite sunny princess for my current YCH :) This YCH will be open until the end of the month, so it's not too late if you want one for yourself! Thanks for looking!