SAG HARBOR, N.Y. — Justin Timberlake is expected to plead guilty Friday following his June arrest in the Hamptons for drunken driving. Justin Timberlake expected in New York court to plead guilty in drunken driving case The boy band singer-turned-solo star and actor will appear in Sag Harbor Village Court on Friday to formally enter a new plea, prosecutors said. Details of the agreement with prosecutors weren’t disclosed, but a person with knowledge of the deal said Timberlake has agreed to admit guilt to a lesser offense of “ driving while ability impaired,” a traffic violation that carries a $300 to $500 fine and a 90-day license suspension. The person spoke to The Associated Press on condition of anonymity because they were not authorized to speak publicly about the deal until it was approved by a judge Friday. The pop star originally pleaded not guilty to a misdemeanor charge of driving while intoxicated and had his driver’s license suspended during a hearing last month. Suffolk County District Attorney Ray Tierney’s office, which is prosecuting the …