LOS ANGELES, CALIFORNIA: Joe Jonas and Sophie Turner's second daughter's name still remains a mystery, but her initials are "DJ", as reported by Daily Mail.

The musician, 34, officially filed for divorce from the 'Game of Thrones' star, 27, on Tuesday, September 5, after four years of marriage.

Joe Jonas says his marriage to Sophie Turner is 'irretrievably broken'

The court documents listed the couple's two children by their initials. Their 3-year-old daughter Willa is listed WJ, while their other daughter, whose full name is not known, is referred to as DJ.

This filing took place in a Miami Dade County courtroom on Tuesday, shortly after news broke that Joe had hired a divorce lawyer.

The court documents additionally indicate that Joe has declared his marriage to the 27-year-old Sophie as "irretrievably broken." They also outline the former couple's intentions to jointly care for their two daughters.

The documents also confirm that the parties signed an "ironclad prenuptial agreement" on April 29, 2019, just days before their secret wedding in Las Vegas.

Joe Jonas and Sophie Turner's love story began in 2016 when they were introduced by mutual friends. They got engaged a year later and excitedly shared the news on Instagram with matching captions that read, "I said yes," and "She said yes."

Their wedding journey continued with two ceremonies, starting with an intimate affair in Las Vegas, followed by a grander celebration in Paris. At the time, their love seemed unbreakable, and they appeared to be a blissfully happy couple.

Now, Joe Jonas has reportedly hired West Palm Beach-based attorney Thomas J Sasser for his divorce, while Sophie Turner's business manager, Carrie Malcolm, is her contact for legal matters.

Who is Joe Jonas' attorney Thomas J Sasser?

Thomas J Sasser is known for representing celebrities in divorce cases, including during Tiger Woods' divorce from Elin Nordegren in 2010, which resulted in a $100 million settlement for Nordegren.

Sasser, who serves as a managing partner at the Florida-based law firm Sasser, Cestero & Roy, has an extensive history of representing high-profile clients.

He handled NASCAR driver Jeff Gordon's divorce from model Brooke Sealey in 2003. He was also reportedly hired by Gisele Bundchen during her separation from NFL star Tom Brady in October 2022.

Joe Jonas' decision to hire Sasser came after he was spotted without his wedding ring on August 11.

Currently, Joe is touring with his brothers Nick and Kevin, while Sophie has been filming the ITVX drama 'Joan' in the UK, where she has embraced vintage looks for her lead role as the notorious British jewel thief Joan Hannington.