Dear Twilight, I am sure you are as excited as I am about the upcomming wedding in Canterlot... wedding??  (reading Celestia's letter out loud, then confused)

Sorry, it's just that shining armor and I have always been so close (saying sorry to her friends for getting upset)

How dare you not tell me in person that you were getting married. I'm your sister for ponies sake! (annoyed with her brother)