Demi Levato and Selena Gomez are set to appear in the Disney Channel's upcoming movie together as two girls whose worlds collide.

In the Princess Protection Program Demi plays a young princess taken into hiding who befriends an Agent's daughter, played by Selena.

Princess Rosalina (Demi) masquerades as a normal school girl called Rosie, while tomboy Carter (Selena) struggles to find her own identity.

Interestingly, both Selena and Demi are best friends in reality after meeting on the set of Barney & Friends.

See a sneak peak of the film below