UPDATE: A representative for the Spears family shared a statement with The Huffington Post claiming that "details the media are reporting surrounding the incident regarding Jamie Lynn's daughter Maddie are incorrect," but did not clarify which details are false.
The statement concluded: "Right now the Spears family asks that everyone respect their privacy during this time and appreciates all the prayers and support for their family."
Jamie Lynn Spears' 8-year-old daughter Maddie Aldridge is in reportedly critical condition after an ATV accident on Sunday, TMZ first reported.
Maddie, niece of pop star Britney Spears, was reportedly submerged underwater during the incident before she was airlifted to a hospital, according to the outlet, which also states that the young girl had been part of a hunting expedition.
Jamie Spears, father of Jamie Lynn and Britney, told Entertainment Tonight: "All I can say is pray for our baby Maddie."
Jaime Primak Sullivan, a publicist who says she worked with the Spears family for years, posted a call for good wishes to Facebook late Sunday.
Jamie Lynn, 25, starred on the popular Nickelodeon show "Zoey 101" as a teenager but left after revealing she was pregnant with Maddie at 16. She became engaged to then-boyfriend Casey Aldridge, but the couple never married. In 2014, the actress married Jamie Watson, a Louisiana businessman.
Maddie regularly appears in her mother's Instagram posts alongside captions detailing family outings and her achievements in school.