In the Summer of 1998, van der Kolk came up with a new project called Loona (leaned on the Spanish word "luna" for "moon"), also produced by DJ Sammy.

By Autumn, it was followed by another single "Hijo de la Luna" (a cover of the Spanish band Mecano) which also reached number 1 on the German charts.

The song itself then had to be removed from Entre dos Aguas, the re-issued versions of the album do not include the track and only can be found on rare and early pressings.

It features covers such as Procol Harum's "A Whiter Shade of Pale", Peter Sarstedt's "Where Do You Go to My Lovely", Ralph McTell's "Streets Of London", Sting's "Fragile" or Bob Dylan's "Blowin' In The Wind".

In May 2008, Loona signed a new contract with Sony BMG/Ariola and returned with her fifth studio album "Moonrise" in October, preceded by its two single releases "Por la Noche" and "Salam Aleikoum", all with limited success.

Professionally and in private, van der Kolk parted ways with her longtime collaborator and father of her daughter, DJ Sammy.

In 2009, Loona returned with the cover version of Cidinho & Doca, "Parapapapapa" to her summer tune roots since "Viva el Amor" in 2001.

[citation needed] Van der Kolk attended the VOX television program Das perfekte Promidinner im Schlafrock.

All these singles to be included on her long-awaited, sixth studio album with the working title Summer Dance, later retitled Rakatakata (Un Rayo de Sol).

[2] Loona appeared as guest vocalist on DJ Cassey Doreen's single "Tell it to my Heart", a Taylor Dayne cover version.

Loona was also guest vocalist on Flava & Stevenson's 2k14 remix of their single "Rio de Janeiro", found on their album Quantum of Dance, which both latter mentioned songs appeared on her first extended play titled Brazil.

Loona is best known for her catchy, good mood, summer vibe tunes such as "Bailando", "Vamos a la Playa", "Mamboleo", "Latino Lover" or "Viva el Amor" with easy beats, sounds, melodies and simple lyrics.

Loona is known for numerous songs and singles being covers of other artists such as Paradisio, Mecano, Herbert Grönemeyer, Luv', Elvis Presley, Sezen Aksu, David Bisbal, Donna Summer, Cidinho & Doca, Miranda, Pigbag, Los Diablos, Taylor Dayne, Barry Manilow, Helene Fischer, Francisco Alves, Gebroeders Ko, Udo Jürgens or Lylloo & Lorinda (Not counting her fourth album Wind of Time, which was a full cover album), which ended up of 21 of her first 42 singles being cover versions so far.

She is also noted for singing multilingual, mostly Spanish, spanglish or English, but also parts in Arabic ("Salam Aleikoum"), French ("Et me voila"), Dutch ("Ademloos door de Nacht") or German ("Gib mir deine Angst", "OMG!

On 10 February 2005, Van der Kolk gave birth to daughter Saphira María with former spouse DJ Sammy, who is also a singer and performs under Firefox alongside her mother.