Princess Celestia was sitting door herself, probably lost in thought.
When suddenly prime Spike's letter finally reached her.
"Ohh, what's this about" Celestia thought outloud, as she opened to letter.
Dear Princess.. Twilight wasn't so sure it was worth sending u this letter. Believing u won't take us seriously about such things, and maybe u won't, but I'm letting u know anyway. Rather u believe me of not. Some dobblegangers escaped into our universe, and I'm hoping that maybe your know a way to bring them back.. And far far away from me. Signally yours. Pinkie Pie.