Pinkie's Cupcake Surprise
"i unfortunately cannot i was hired to do some designing for princess cadance and prince shining armor for a ball in the crystal kingdom."
MLP: Believing in the Impossible - Chapter Seven
During then, most likely, i believe that princess cadance planned to reveal that special news there!"
MLP: Believing in the Impossible - Chapter Five
When with them, he bowed politely to his bemused superiors before going on through his pants from the good gallop, "your niece, crystal princess cadance, requests your aid!" "aid?"
Antecedent
"if you paid attention during history class, you would know that princess cadance and shining armour thwarted an incursion attempt by queen chrysalis, leader of the changelings." celestia stated.
MLP The Chronicles of Fierce Charge: Hearts and Hooves Day Massacre
On further inspection of the area fi spotted the slightly familiar form of the youngest princess, cadance, who had obviously just replaced a book to the shelves where she had been standing to watch the ponies entering the room.
An Affliction of the Heart
princess cadance stared down at warden as well, and then exchanged an urgent, hushed conversation with her husband in quiet whispers.
Chapter Eight: Of Souls and Secrets (edit 9/16/2015)
I had been told her brother, prince shining armor, did the same for his wife, princess cadance, to a degree.
Corruption
Canterlot castle was her goal - home to princess celestia, princess luna, princess cadance, and numerous well-trained unicorn mages working in the royal guard and royal libraries - including her own brother, shining armor.