My Little Pony: Friendship Is Magic (2010)

S5E19 The One Where Pinkie Pie Knows

Pinkie Pie finds herself in a tricky situation when a secret about Princess Cadance and Shining Armor accidentally slips out. Determined to protect their privacy, she goes to great lengths to keep the information under wraps, navigating the challenges that come with maintaining the secret. As she juggles her friends' curiosity and her own excitement, Pinkie learns the importance of discretion and loyalty in friendships.