Robin Thicke has been arrested for marijuana possession in New York City … this according to law enforcement. According to law enforcement, 34-year-old Thicke was busted this afternoon in Manhattan near Madison Square Park — after police claim they saw the singer lighting up a joint inside a black SUV. Sources tell TMZ, Robin was extremely cooperative — and even signed a couple autographs. Thicke was given a desk appearance ticket and released soon after. A rep for Robin Thicke had no commen