Delphine Boel, who claims she is the natural daughter of King Albert II of the Belgians, has dropped her lawsuit against King Philippe and his sister, Princess Astrid.
The lawyers for Ms Boel, 45, will file "new proceedings" next week against Albert, who abdicated in July, and her legal father, Jacques Boel, in order to establish "her true paternity."
Delphine's mother, Baroness Sybille de Selys Longchamps, was married to Jacques Boel, when she allegedly had an affair with then Prince Albert in the 1960s.
The information was published in 1999 in a book. In his annual New Year's speech at the end of that year, King Albert acknowledged that his marriage had gone through a crisis 30 years earlier, but did not come out and acknowledge Delphine.
Since then, the Belgian artist has been fighting to prove she is Albert's natural daughter. Her mother recently spoke to Belgian television, acknowledging that she had an affair with Albert.
King Albert lost his immunity to lawsuits after he abdicated on July 21.