The Barbie Adventure IV: Barbie as the Princess and the Pauper

Things take a turn when the Equestria Girls enter the world of Barbie in the Princess and the Pauper. Twilight, Applejack, Rainbow Dash, and Sunset find themselves meeting the princess Anneliese, while Pinkie, Rarity, and Fluttershy stumble into the life of the pauper Erika. Both girls seem to be living completely different lives, so it's a shock when Anneliese and Erika meet up, and the only two things that are different about them are their hair and their birthmarks (Anneliese has the royal birthmark; Erika doesn't have any).
Suddenly, Anneliese is kidnapped by the minions of the royal advisor, Preminger. Not only that, but Erika rebels from the script and goes along with Rainbow Dash and Sunset to find her. Julian, getting worried, says that Applejack has to pose as the missing princess so they can find her, since she's the closest to Anneliese. However, Anneliese was to marry King Dominic the next week, and he's falling for "Anneliese." Translation: he's falling in love with Applejack. However, Preminger, who had staged Anneliese's kidnapping, knows something's wrong, that either Anneliese escaped so cleverly or that there's something else going on he's unaware of. Meanwhile, the real Anneliese has found herself trapped in the same dress shop Erika lived in, with Madame Carp mistaking her for Erika. The real Erika, Rainbow Dash, and Sunset have just made it to the palace, just as Preminger reveals that Applejack had been playing Anneliese this whole time. With all the confusion going on, will the movie reach the happy ending Pinkie knows and loves? Or will this story change for the worse?

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Barbie and the movie's dialogue/lyrics belong to Mattel. Equestria Girls belong to Hasbro.