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KiiiKiii (Korean: 키키) is a South Korean girl group formed by Starship Entertainment. The group consists of five members: Leesol, Sui, Jiyu, Haum, and Kya. They debuted on March 24, 2025, with the extended play Uncut Gem.

The name "KiiiKiii" is a play-on-words in both Korean and English. In Korean, it is an onomatopoeia representing the sound of giggling, often described as "kiki" (키키), evoking a lighthearted and joyful feeling. In English, the name is symbolic of the word "key", signifying that the group strives to continue finding the "key" to life's answers with a smile on their face.

On February 10, 2025, Starship Entertainment announced that it would be debuting a new girl group KiiiKiii, with the surprise launch of the group's social media accounts. Six days later, it was announced that the group's debut extended play Uncut Gem, would be released on March 24. That same day, the members were unveiled, and the music video for "I Do Me", a track from the EP, was released. On February 23, they released a celebratory music video titled "Debut Song" to commemorate their upcoming debut. On April 5, KiiiKiii won their first music broadcast trophy since debut on Show! Music Core with "I Do Me". On May 11, the group did their first international performance at KCON Japan. On August 6, they released their first digital single "Dancing Alone", with the lead song of the same name and B-side song "Strawberry Cheesegame". On October 28, it was revealed that Kakao Entertainment will release the web novel Dear.X: Tomorrow's Me, Today's Me, featuring KiiiKiii as its main characters. On November 4, the group released the song "To Me from Me", produced by Tablo, as its soundtrack.

In January 2026, KiiiKiii had been appointed the official promotional ambassador for Seoul Metropolitan Government's newly redefined city color system "Seoul Color", which will be used by both public and private entities for festivals, public events, products, visual information, and in urban spaces to reflect changes in the digital era. In July, the group was appointed as a goodwill ambassador of Gangnam-gu for two years, promoting its policies and cultural and tourism resources through contents and major events in the district.

In April 2025, it was announced that KiiiKiii was selected as first promotional model for KakaoBank to strengthen its brand image "KakaoBank Mini", which aims to provide convenient financial services to young customers. On April 28, it was announced that the group became the promotional model for "King Fusion", a dessert menu of the fast food chain Burger King. It was followed by "All Day Snack" campaign and using "Debut Song" as its promotional song in July. In October, contemporary brand Thursday Island unveiled KiiiKiii as its muse, participating in its "Whispers of a Playful Winter" campaign.

In January 2026, the group was selected by Japanese lifestyle culture store WEGO as its promotional model for 2026 Spring season. In February, KiiiKiii collaborated with the American headwear brand New Era, presenting the brand's 2026 S/S collection. In April, they became the face of the Danish jewelry brand Pandora's "Be Your Lucky Charm" campaign. In June, KiiiKiii collaborated with GS25 to release strawberry and mango flavored gelato bars.