Troubled singer Amy Winehouse was temporarily released from rehab on Monday - to apply for a U.S. visa. The hitmaker left the London clinic for just a few hours to meet officials at the U.S Embassy. She was accompanied by her father Mitch and a nurse, as the terms of her treatment mean she must remain under supervision at all times. It is believed Winehouse is applying for a visa to attend the Grammys in Los Angeles on February 10, where she is nominated for six awards. But a spokesperson for the star said no decision had been made on whether or not she will attend the ceremony. A statement reads: "The appointment at the U.S. Embassy was made some time ago and was part of process for obtaining a visa. No decision has been made about the Grammys. Amy was accompanied by a nurse as the appointment was under supervision. She has not left rehab and remains under the care of the clinic." Winehouse was banned from the U.S. last October after she was arrested and fined in Norway for possession of cannabis.