Celebs who attended Ashton’s 30th birthday party at Socialista in the West Village on February 7th are urged to get tested and vaccinated for hepatitis after an employee who served the party guests was diagnosed with the disease.

Among the partygoers were Madonna, Salma Hayek, Kate Hudson, Madonna and Bruce Willis.

Page Six reports:

A Socialista bartender named Leif, who’s now in the hospital, was diagnosed with a raging case of Hep A. We’re told the Health Department yesterday visited the club that former Bungalow 8 doorman Armin Armiri opened last fall, but Armiri said, “We’re not closed down, we’re just concerned for our customers.”

Yikes, let’s hope that none of these Hollywood A-Listers are infected.  Heaven forbid that any regular people were in the club and aren’t famous enough to know that they need to head to the nearest clinic, ASAP.