Chloe Sevigny bailed on her hosting duties at the ninth-anniversary party for Nylon magazine Wednesday night, over a mystery illness Page Six reports.

Sevigny collapsed on her way to 1Oak, and her friends rushed her home. "She felt lightheaded and sick, she went to the doctor Thursday morning and found out it was a viral infection, probably due to something she ate," said Sevigny's rep. Sevigny's DJ brother, Paul, cut into a cake decorated with his sister's face, and spun for the likes of Jessica Stam, Nick Cannon and Heatherette designer Richie Rich.