Grimes is suing her ex Elon Musk over an issue involving their three children.
Born Claire Boucher, the "Genesis" star filed a "Petition to Establish Parental Relationship" in a California court on Sept. 29, court records obtained by Page Six show.
When the child is unmarried, the request is intended to make the court identify the legal parents of the child.
Although the docket for the case is public, the filing is sealed; However, it does not appear that the Tesla co-founder has responded to Grimes' plea.
Grimes, 35, and Musk, 52, began dating in 2018 and were in a relationship until September 2021 when they split.
The Canadian artist gave birth to their firstborn, a son named X Æ A-Xii, in May 2020, and the former couple quietly welcomed daughter Axa Dark Sideral, aka Y, via surrogate in December 2021.
In September, journalist Walter Isaacson's "Elon Musk" biography revealed the SpaceX founder and Grimes had secretly had a third child,.
A boy named Techno Mechanicus, whom they affectionately named Tau. It is unclear when Tau was born.
Grimes' plea comes just weeks after she pleaded with Musk on Twitter to be allowed to see their son.