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"Another pinch me moment," Delevingne gushed. "Mirror, Mirror is a twisty coming-of-age story about sixteen year old friends Red, Leo, Naima and Rose who are all trying to figure out who they are and navigate the minefield of school and relationships."
The turn as an author is a new step for the Suicide Squad star, but she appeared very excited to share her new work.
"I want us to talk about this time in life, self discovery, friendship, pain, triumph!! Being a teenager!! The experiences that shape YOU," she said in her Instagram post.
The novel's official release date is Oct. 7, 2017 but it is already available for pre-order on Amazon.