Dozens of celebrities who attended Ashton Kutcher’s 30th birthday bash at a Manhattan nightclub several weeks ago are being urged to get vaccinated for hepatitis A. Health officials offered free shots after a bartender at Socialista was found to have the infectious liver disease. Among the 700 people who may have been exposed were Kutcher’s wife, Demi Moore; her ex-husband Bruce Willis; Gwyneth Paltrow; and Madonna. “Most people recover within a few weeks with bed rest and avoiding alcoholic beverages,” said Health Department spokeswoman Jessica Scaperotti.