"It makes [filming] 10 times more fun," Zendaya tells TVGuide.com. "I get to do it with my best friend and someone who I love dearly."
In the movie, the girls play two friends who come to fight over a fashion editor job. Zendaya describes her character Halley as a "chic nerd" while Thorne says her Avalon is much more of a "girly" fashionista.
Watch the video interview to find out more about their upcoming film and to see what's in store on their Disney Channel series Shake It Up.
Frenemies premieres Friday at 8/7c on Disney Channel.