Kimagure Princess (気まぐれプリンセス; Fickle Princess) is the 41st single released by Hello! Project unit Morning Musume. It was released on October 28, 2009 on the zetima label in 3 editions: 1 regular and 3 limited editions. Limited Editions A and B come with bonus DVDs while Limited Edition C comes with 10 interchangeable covers, one featuring each member and one group shot. The single was used as the ending theme for TV Tokyo's The Gyakuryuu Researchers.
This was the last single to feature seventh generation member Kusumi Koharu. .