The Sisterhood of the Traveling Secret Princesses is the movie that Nico saw with Sonny in the episode "Sonny in the Middle". This movie chick flick about three princesses who shared a tiara. All three secret princesses' heads fit in the same tiara, which made them sisters and princesses. The same tiara is said to be a key that opens the door to the secret unicorn stable. At some point in the movie, all three secret princesses whisper into their dream pillows and ride their rainbows to Magic Land. This movie is also known to have 3Ds: Depth, Devotion, and Dreams.