Police are searching for troubled singer Mindy McCready and her five-year-old son Zander, who both disappeared Tuesday night in Florida during an apparent dispute.

McCready, 36, doesn't have legal custody of the child but is allowed visitations. She was last seen after she picked up the boy from her dad's Cape Coral, Fla., house.

The star and the court system are apparently at odds, and a missing persons report has been filed. A judge has ordered Mindy to return Zander by 5 p.m. Thursday.

McCready's parents have legal custody of the boy.

Late Tuesday night McCready posted a Facebook message refuting this, saying, "My son is not missing" and that "police established that this afternoon via Skype."

"I have been fighting the Florida court system to protect my son, and bring him home," she writes to ... all the individuals who follow Mindy McCready on Facebook.

"Please, please do not worry."

McCready has been plagued by myriad personal problems in life, such as a drug overdose, suicide attempt(s), rehab and an underage affair with Roger Clemens.