The troubled pop star Britney Spears was released on Saturday from Cedars-Sinai Medical Center in Los Angeles, The Associated Press reported. She had been taken there by paramedics on Thursday night, when the police were summoned to her home after a dispute with her ex-husband, Kevin Federline, about their sons, Sean Preston, 2 and Jayden, 1. On Friday a court commissioner suspended the right of Ms. Spears, 26, to visit the children and awarded sole physical and legal custody to Mr. Federline before scheduling another hearing for Jan. 14. Previously Mr. Federline had temporary custody, and Ms. Spears had court-monitored visitation rights. After seeing Ms. Spears in the hospital, Phil McGraw, the television psychologist, said, “My meeting with Britney and some family members this morning in her room at Cedars leaves me convinced more than ever that she is in dire need of both medical and psychological intervention.”