About Maimi Yajima
Maimi Yajima (矢島 舞美, Yajima Maimi; born February 7, 1992) is a Japanese singer and actress. She was a member and the leader of Cute, a girl idol group within Hello! Project. Despite not being the oldest, Yajima still became the group's leader, after Erika Umeda turned down the role. The group did not make its official debut until late in 2006, with their first official single released in February 2007.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.