Takahashi Ai is a Japanese pop singer associated with Hello! Project, best known as the current leader of Morning Musume, former member of its popular subgroup, Mini Moni, and most recently given the leadership role as Hello! Project's leader. Takahashi Ai joined Morning Musume in 2001 as part of the group's fifth generation, along with Makoto Ogawa, Asami Konno, and Risa Niigaki.

Her audition involved a training camp of three days and two nights, in which participants were expected to learn a new song, a dance routine and a script. Out of 25,000 applicants, nine were selected for the camp in which Takahashi passed. 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, 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, 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, she 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.

Takahashi's vocals became more prominent on the second and final Mini Moni album, Mini Moni Songs 2 (2004), as well as on Morning Musume's singles from their Spring 2004 release "Roman: My Dear Boy" onward. She also had a duet with Tsunku on the cover version of Tsunku and Ayumi Hamasaki's duet "Love: Since 1999" on his solo album Take1.
In 2005, Morning Musume's first single release of the year, "The Manpower!!!", featured Takahashi in a prominent co-lead-vocal role, a role she has retained on subsequent singles since. In the summer of that year, she became part of the 2005 shuffle Group Elegies.

Following then-leader Hitomi Yoshizawa's graduation from Morning Musume on May 6, 2007, the current sub-leader, Miki Fujimoto ascended to the leader position, with Takahashi becoming the new sub-leader of the group. However, on June 1, 2007, after Fujimoto's resignation, Takahashi took over as the new leader. In 2008 Takahashi became a member of Hello Project's new unit High-King, a group created to promote Morning Musume's upcoming Cinderella the Musical, in which Takahashi will play the main character.

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.
In September 2010, she became the second Morning Musume member to be at least 24 years old and the first to reach that age while in the group (original member Yuko Nakazawa was 24 when the group was formed).
On January 9, 2011 it was announced that Takahashi would graduate from Morning Musume at the end of the Fall tour that year, passing leadership of Morning Musume and Hello! Project to current sub-leader Risa Niigaki.

She married comedian Abe Koji on February 14, 2014.
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