KAT-TUN (カトゥーン, Katūn^?) is a Japanese boy band formed by Johnny & Associates (Johnny's) in 2001. The group's name is an acronym based on the first letter of each member's family name until the departure of Jin Akanishi in 2010. As of 2010, KAT-TUN stands for Kazuya KAmenashi, Junnosuke Taguchi, Koki Tanaka, Tatsuya Ueda, and Yuichi Nakamaru. Their debut on March 22, 2006 was marked by a tripartite release of a CD single, album and music DVD on their exclusive record label J-One Records. Since then, all of their single, album and music DVD releases have debuted at number one on the Oricon music and DVD charts.

Before becoming KAT-TUN, each member belonged to different trainee units within Johnny & Associates. In 2001, eight members were chosen to become a temporary dancing unit in order to support Koichi Domoto in the NHK music program, Pop Jam. The eight members were switched around before it officially became KAT-TUN, with the current five members plus Jin Akanishi. Although the formation was only meant to be a temporary support unit, KAT-TUN gained a great deal of attention and became a solid unit.

Willard Christopher "Will" Smith, Jr. (born September 25, 1968), also known by his stage name The Fresh Prince, is an American actor, producer, and rapper. He has enjoyed success in television, film and music. In April 2007, Newsweek called him the most powerful actor in Hollywood. Smith has been nominated for four Golden Globe Awards, two Academy Awards, and has won multiple Grammy Awards.

In the late 1980s, Smith achieved modest fame as a rapper under the name The Fresh Prince. In 1990, his popularity increased dramatically when he starred in the popular television series The Fresh Prince of Bel-Air. The show ran for nearly six years (1990–1996) on NBC and has been syndicated consistently on various networks since then. In the mid-1990s, Smith moved from television to film, and ultimately starred in numerous blockbuster films. He is the only actor to have eight consecutive films gross over $100 million in the domestic box office and the only one to have eight consecutive films in which he starred open at #1 spot in the domestic box office tally.

Maki Horikita (堀北 真希, Horikita Maki^?, born October 6, 1988) is a Japanese actress. She debuted in 2003 as a U-15 idol and has since starred in Japanese television dramas, television and magazine advertisements, and movies. Horikita's roles include the shy student Nobuko "Nobuta" Kotani in Nobuta wo Produce, the righteous law student Tsurara Yoshikawa in Kurosagi, and the crossdressing sports fan Mizuki Ashiya in Hanazakari no Kimitachi e.

Maki Horikita was born on October 6, 1988 in Kiyose, Tokyo, Japan. Horikita is the eldest of three daughters, she has two younger sisters. Known to be boyish in her childhood, Horikita enjoyed playing basketball and baseball as well as mock games of Dragon Ball Z with boys. Despite her boyishness, Horikita looked up to her mother. This was revealed when she appeared in an episode of KAT-TUN's now-defunct variety show Cartoon KAT-TUN where she mentioned that she liked imitating her mother when she was younger.

In junior high school, Horikita served as the vice-president of the student council and the vice-captain of the basketball club. In class, she was dubbed "The Boss of 3-C” in recognition of her status as the class representative. As she became more active in the entertainment industry, she put her club and council activities on hold. Being unable to meet her many commitments, she finally withdrew from her extracurricular activities, concentrating solely on completing her high school education and developing her career in show business.