He's got his own blog, TV show and made millions of pounds, but now the polar bear Knut has become a film star.
Knut hit the headlines when he was abandoned by his mother and brought up by keepers at Berlin Zoo in Germany.
Loads of people were crazy about him and flocked to see the little polar bear, but others said it was wrong for humans to hand-rear a wild animal.
Now everyone can get a behind-the-scenes glimpse of Knut's life in the film Knut and Friends.
The movie shows Knut drinking his first bottle, balancing on a scale, and rooting through a bucket of fish.
It also follows the stories of a polar bear family in the Arctic and a pair of brown bear cubs from Belarus, in eastern Europe.
Knut has now grown too big to play with his keeper, Thomas Doerflein, and lives in an enclosure all by himself.
Mr Doerflein went to see the film when it was shown for the first time and said: "I like the movie. It's well done and it shows the parallels between nature and raising by hand."
The film will be shown across Germany from Thursday, but it's not known if it will be shown outside of the country.