Britney Spears is on a psychiatric hold in a Los Angeles hospital as she undergoes evaluation.
The 26-year-old was taken from her home to hospital yesterday by ambulance.
Speaking to People magazine, Spears' representative, Sam Lutfi, said that Spears was undergoing evaluation on the orders of her psychiatrist.
"She went willingly," Lufti told the magazine. "It was like something in her heart was telling her she should go. She knew something was wrong."
UCLA Medical Center declined to confirm if Spears was a patient, citing confidentiality.
Spears' parents and Lufti were pictured leaving the hospital on Thursday. When asked if her daughter was "OK" by reporters, the singer's mother Lynne said: "Yes."
Friends and family have said they believe that the 26-year-old is suffering from bipolar disorder or other psychiatric problems.
An unnamed source told Us Weekly that Spears had not slept since Saturday.
The source said that the "intervention" by Spears' family and psychiatrist had been planned for a number of days.
The National Alliance on Mental Illness in the US has pleaded for Spears' privacy during her treatment.
