The 4 Minutes singer who made her directing debut with this year's Filth and Wisdom admits she gets more pleasure from films because she has more time to express herself.
She said: "I prefer movies because you have more time to tell a story. You have an hour-and-a-half or two to save the world."
The mother-of-three - who is married to director Guy Ritchie - also revealed she wants to make more movies in the future, but isn't willing to give up music yet.
She told Britain's Hello! magazine: "I'd like to become a better human being. I'd like to learn more than I already know. I'd like to be a better parent. I still have my children to raise and that is a big responsibility. I'm not done with that.
"I'd also like to write and direct more films. I've only done one, so to me that is the beginning of that career. And I want to make some more records because I love music."