Crystal Kay Williams (クリスタル・ケイ・ウィリアムズ, Kurisutaru Kei Wiriamuzu, born February 26, 1986) is a Japanese singer, songwriter, actress and radio host.

After releasing her first single, "Eternal Memories" (1999),[1] Crystal Kay gained fame for her third studio album, Almost Seventeen (2002), which debuted at number 2 on the Japanese Oricon charts.

Her seventh studio album, All Yours (2007) became Crystal Kay's only number-one release in her career when it debuted on top of the Oricon chart in June 2007.

[12] As a child, Crystal Kay met artists such as Diana Ross and Bobby Brown through her parents taking her to shows.

Almost Seventeen became Crystal Kay's breakthrough album, exceeding expectations and debuting at number 2 on the charts behind Mai Kuraki, selling 51,360 in its first week.

4 Real debuted at number 6 on the charts behind household names in Japan such as Aiko, Do As Infinity and Mika Nakashima and sold 86,310 copies in its first week.

Crystal Kay performed at the 2003 Mnet Music Video Festival in Seoul, South Korea to promote its release.

The single was released on October 5, 2005, and peaked at number 2 on the Oricon charts, much like "Koi ni Ochitara" earlier that year.

[citation needed] On February 8, 2006, Crystal Kay released "Kirakuni" / "Together", her nineteenth single and the second A-side to be sung entirely in English.

This single was recorded in the U.S. with producers Jam & Lewis, who are known for working with the likes of Crystal Kay's idol Janet Jackson and Mariah Carey.

"Konna ni Chikaku de..." was performed live for the special Nodame Orchestra concert at the Tokyo International Forum on the single's release date.

On March 3, 2008, it was revealed that Crystal Kay was chosen to sing the theme song to the 2008 Pokémon film Giratina to Sora no Hanataba: Sheimi.

On February 18, 2009, Crystal Kay was a featured artist with Verbal of M-Flo on the song "Universe" with South Korean singer BoA from her single Eien/Universe/Believe in Love.

[citation needed] "After Love" was written by Craig McConnell and Canadian artist Shobha, with Japanese lyrics by Crystal Kay.

[45] The single's b-side, "Deaeta Kiseki", was released digitally in December 2008 and was also used as the CM song for Tully's Coffee that month.

The fourth track "Helpless Night" is a collaboration between Crystal Kay and Jin Akanishi of KAT-TUN and is performed almost entirely in English.

She played the character of Kokusho Akira, a genius hacker who has carried out many crimes all over the world in the Nippon Television drama Hidarime Tantei Eye, which stars Hey!

[54] On June 22, it was announced that Crystal Kay would sing both the opening and ending theme songs, "Time of Love" and "Cannonball" respectively, to the NHK drama Jūnen Saki mo Kimi ni Koishite, starring Aya Ueto.

[55] Crystal Kay released her next single "Journey (Kimi to Futari de)" on November 24, followed by her ninth studio album on December 8.

Crystal Kay's Spin the Music tour was planned to have nine shows across Japan starting February 5 and ending March 29, 2011.

"[62] In terms of music, she succeeded in refining her skills despite not being able to make her international debut: "My goal was to get a record deal there, but I thought it would be better to actually live there, join the local community, and get to know the producers, so I decided to take the plunge.

[76] Later that year, she participated in the first season of The Masked Singer Japan under the stage name "Miss Television" and finished the show as the runner-up.

[citation needed] On November 5, she released her 12th digital single "Hitori ja nai Kara", which was used as the theme song for the movie DANCING MARY.

RIZE, a Japanese NBA tour planning and dance team production company, was approached by the Washington Wizards about "JAPAN NIGHT" and offered the event to Crystal Kay.

[85] In February 2023, Crystal Kay released her first English EP, Start Again, a collection of three original jazz tracks and one cover.

She previously appeared in the U.S. and European versions of Bust a Groove in 1998, as the uncredited singer of the song "Shorty and the EZ Mouse" prior to her debut.

In August 2023, Crystal Kay announced two "Live in LA" shows for two weeks later in Los Angeles, one acoustic and one with a full band, both of which sold out.

In September 2023, Crystal performed with collaborators Jimmy Jam and Terry Lewis at the Pittsburgh International Jazz Festival.

[90] In a video interview with Rolling Stone India in September 2024, Crystal announced that she is planning her first ever tour of the United States.

At a summer festival that year, the half-Japanese half-Papua New Guinean singer Emi Maria left Crystal Kay a demo and a note saying, "You're my idol, I'm sad I couldn't meet you in person.