I can´t seem to find this movie

I saw this movie more than 10 years ago, as a child. I can only remember a few details. It was a movie with real actors, the protagonist was a withe actress, age mid/ end-20´s and blond hair. The movie itself was about this girl, she went into her new bedroom (i don´t know if she moved to this new place or if she had to stay there). It was beautifully painted with stars on the ceiling. At night the star became real. When writing this i´m starting to think that it could be possible that the ceiling was a blue sky with clouds and at night it became a nightsky with the stars. I think she became this princes with a blue dress with stars on (not sure about this part). When you would enter the room you had to take like a few steps down. I don´t remember it beign scary or dark. Again, I saw this as a 7 year old or something like that age and i´ve only seen it once. I´ve asked my parents, friends and even AI but they couldn´t remeber/ find it. (AI thought about ´stardust´ but it is not that one) 

I really do hope someone can help me or also remembers this movie. So please let me know if you do!! (English isn´t my first language, excuse me in advance for mistakes)