Ten years ago today, the first episode of Hannah Montana aired on the Disney Channel. Telling the story of a teenager living a double-life as a pop star, the show was not only a massive success but it also launched the acting and music career of its star, Miley Cyrus. She took to her Instagram today to share her thoughts on the anniversary, writing: "To the world it's a celebration of 10 years but for us the journey began way before the world had any clue who any of us are."