My Little Pony: Pony Life Season 2 Episode 6
The Tiara of Truth
When Pinkie Pie's friends except Rarity are late to a certain cupcake testing, she uses a magical tiara (given to her by Fluttershy) to find out the real reason why they couldn't come.
When Pinkie Pie's friends except Rarity are late to a certain cupcake testing, she uses a magical tiara (given to her by Fluttershy) to find out the real reason why they couldn't come.