A bartender at Socialista nightclub in New York City was infected with Hepatitis A when serving at Ashton Kutcher’s birthday bash.

TMZ reports that big stars like Madonna, Gwyneth Paltrow, Salma Hayek, Demi Moore and Bruce Willis were among the guests.

The New York City Health Department urged everyone who were at the club on Feb. 7, Feb. 8 and Feb. 11 to get a hepatitis A vaccination as a precautionary measure.

Hepatitis A is a liver disease caused by a virus which is most commonly transmitted by the fecal-oral contact via contaminated food or drinking water, according to the Health Department.

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