AP Photo/Scanpix Norway, Sara JohannessenUma Thurman's ex-fiancé Arpad Busson has just sued the actress for custody of their 2-year-old daughter, Rosalind.
Multiple outlets report that the French financier filed an emergency order in New York Supreme Court earlier today, however the papers are sealed.
Specifics regarding his filing are unknown currently, and his attorney declined to comment to E! News on the matter.
"It is unfortunate that this very private discussion regarding Mr. Busson's visitation rights and his participation in decision making has been made public," a spokesperson for Thurman tells E! News in a statement. "However, we are optimistic that a fair agreement for both sides will be reached out of court."
The Pulp Fiction star dated Busson on and off since 2007, but the two ended their engagement in April of this year.
Thurman and Busson welcomed their baby girl, Rosalind Arusha Arkadina Altalune Florence Thurman-Busson (Luna for short) back in July 2012.
During an interview with Jimmy Fallon, the Kill Bill actress credited her elder daughter for coming up with the lengthy, unique name.
"[Maya] came up with the best excuse, [which] was that I probably wouldn't get to have any more children, so I just put every name I liked into [Luna's]," she explained on the late-night talk show.
"We couldn't quite agree on the name. We call her Luna, so she's lucky that way. And then the rest, she can name all her own children all these interesting names," she joked. "Proud, Catholic, observant!"
Thurman has two children with her ex-husband Ethan Hawke: Maya and Levon.
Hawke and Thurman married in 1997 but broke up in 2003. Their divorce was finalized two years later.