Justin Timberlake played the celebrity card in a New York courtroom, which insiders claimed helped him dance away from drunk driving charges. RadarOnline.com can reveal the SexyBack singer’s sweetheart plea deal has been slammed by legal experts, who claimed Timberlake’s case is a classic example of the kid-glove treatment A-listers are given in the celebrity-studded Hamptons. Timberlake, 43, somehow convinced prosecutors and the judge overseeing his case to agree to a slap-on-the-wrist deal. He pleaded guilty to driving while ability impaired, a charge that carries a mere $300 to $500 fine – …