Article continues below advertisementAubrey O'Day faced an unexpected medical emergency. The singer, 41, revealed on Wednesday, December 10, that she was hospitalized and unable to perform in Danity Kane's reunion show in Los Angeles, Calif.O'Day took to her Instagram Story hours before the performance to share the sad news. Article continues below advertisementSource: MEGAAubrey O'Day was hospitalized on Wednesday."My loves... I am so sorry. I've become extremely sick and physically can't make tonight's show as I'm in the ER," she wrote.