K3 is a Belgian-Dutch girl group with a Dutch-language pop repertoire, consisting of Hanne Verbruggen, Marthe De Pillecyn, and Julia Boschman.

The signature style and iconicity of K3 rely on all three girls mostly wearing the same outfit, and they are traditionally a redhead, a brunette, and a blonde.

The group's name is derived from the first letters of the three first members from 1998: Karen Damen, Kristel Verbeke, and Kathleen Aerts.

On 6 November 2015 Karen, Kristel and Josje were succeeded by Hanne Verbruggen, Klaasje Meijer and Marthe De Pillecyn after they became the winners of K3 Zoekt K3.

On 9 February 2021 Klaasje announced her departure from K3 and another audition reality show was held in the same year to find a new member.

She was supposed to be replaced by Deborah Ostrega, but she immediately withdrew after she signed the contract, because she didn't want to sing in Dutch.

[2] Ultimately, William managed to find Kathleen Aerts as a replacement and because again someone joined with a 'K' as the initial letter, they decided to change the name of the band to K3 on 13 November 1998.

K3 is noted for being the first pop act to break through to the top of the charts without receiving any airplay from the regular music television channels.

[4] In 2002, Niels William sold the band to Studio 100, a Flemish television production company for Dutch and Belgian programs, movies and musicals.

In 2010, K3 shot new episodes for their kids-talkshow (this time with Josje) and also started their own sitcom called "Hello K3", in which they portray fictional versions of themselves living in the same building and trying to balance a normal life with being superstars.

On 6 November 2015 Hanne Verbruggen, Klaasje Meijer and Marthe De Pillecyn had been chosen as Karen, Kristel and Josje's successors (respectively) and would become the new K3.

The tour with double occupancy was a great success and was extended, there was also a special 'adult evening show' with standing room.

[14] At the end of 2016, the special Het dagboek van K3 (The Diary of K3) was released, in which K3 looks back on the past year.

That same year, the new K3 got their first movie called K3 Love Cruise and there was a new special: Overal K3 (Everywhere K3), in which Hanne, Klaasje and Marthe showed more of themselves and talked about the impact of K3 on their private lives.

In 2019, the band celebrated their 20th anniversary with a spectacle show with moving stands, stages and LED Walls.

The last performance of Hanne, Klaasje and Marthe as K3 was on 6 November 2021 at the Sportpaleis for 'Back to the Nineties and Nillies', the same date on which they became K3 six years ago.

Marthe De Pillecyn had tested positive for the coronavirus and could not be physically present, she performed by video connection.

Now with Julia, they were again television judges/coaches of The Voice Kids in Flanders for season six and they also continued vlogging and releasing music videos of their songs.

After which it was decided in October that K2 zoekt K3-finalist Diede van den Heuvel would fill in for her for the rest of the shows of the 2022 tour.

During the ending song of K3's performance at The Grote Sinterklaas Show in December 2022, their good friend and also the daughter of their boss Marie Verhulst, sang for Hanne, who had just given birth to her son at that time.

[36] In February 2023, after reuniting with Hanne after her maternity leave, their second concert tour 'Vleugels' started and they were part of season 9 of Liefde voor muziek, the Flemish version of The Best Singers.

[38] In September, a K3 fashion exhibition was organized in Wijnegem Shopping Center in honor of the group's 25th anniversary.

[44] On 3 August, K3 debuted by performing at Pride Amsterdam during the Canal Parade, with also having attention/support to deafness and sign language.

[46] The movie named K3 en Het Lied van de Zeemeermin (K3 and the Mermaid's song) premiered in December.

They played the eponymous three pigs, Knirrie (Verbeke), Knarrie (Damen) and Knorrie (Aerts) and reprised these roles in 2007, now also having one location in The Netherlands.

In 2011, they came back with a new musical, Alice In Wonderland with Josje Huisman, who had joined the group the previous year.

The third theatrical K3 movie, K3 en de Kattenprins (K3 and the Cat Prince) had its Dutch premiere on 20 December 2007.

It was announced on 14 May 2020 that K3 will be filming the seventh K3 movie, K3 Dans van de Farao (K3 Dance of the Pharaoh).

This is the second movie of Hanne, Klaasje and Marthe, and features the regular cast of their fiction series, K3 Roller Disco.

In April 2024 it was announced that the eighth K3 movie was on its way, K3 en Het Lied van de Zeemeermin (K3 and the Mermaid's song).