With a voice like Demi Lovato's, you can't give her a cameo in a movie without expecting her to steal the show. That's exactly what she does in the hilarious new Netflix movie, Eurovision Song Contest: The Story of Fire Saga. It stars Will Ferrell and Rachel McAdams as washed-up Icelandic pop stars, and Lovato plays the role of fellow Icelandic singer, Katiana. But while her voice is, as usual, a next-level listening experience, Lovato's hair deserves its own line in the credits. Usually a brunette, Lovato has tried blonde hair here and there, but typically goes back to a dark brown shade that looks eternally amazing on her.