Ai Takahashi

Ai Takahashi took part in Morning Musume in 2001 as part of the group's fifth generation, along with Makoto Ogawa, Asami Konno, and Risa Niigaki. Her debut with the group was on their single "Mr. Moonlight ~Ai no Big Band~", and her first appearance on a Morning Musume full-length release was their fourth studio album, the appropriately named 4th Ikimasshoi!. Her first appearance within a Hello! Project shuffle unit release was on the 2002 single "Shiawase Beam! Suki Suki Beam!" under the group name Happy 7.

In 2003, Ai Takahashi replaced Mari Yaguchi in the Morning Musume spinoff group Mini Moni, first appearing in the group's movie Mini Moni ja Movie: Okashi na Daibōken! and its accompanying soundtrack. Her best-known nickname amongst non-Japanese fans, "Takitty", was derived from the cat suit (complete with tail) which she wears in the movie. Later in 2003,

Ai Takahashi was part of the Morning Musume splinter group Morning Musume Sakuragumi, which performed mainly slower numbers on the group's two EPs, "Hare Ame Nochi Suki" and "Sakura Mankai", and the shuffle group 7Air, an R&B-inspired septet. As of January 2009, Ai Takahashi and Risa Niigaki have the longest tenures of any member. She is also one of only four members to remain in the group for seven years or more (the others being Kaori Iida, Yoshizawa and Niigaki).On February 1, 2009, during the "Hello Pro Award '09 ~Elder Club Sotsugyō Kinen Special~" concert held at Yokohama Arena, Yuko Nakazawa passed on her leadership position in Hello! Project to Takahashi.