Marianne Faithfull is being treated for COVID-19 in a London hospital, Billboard can confirm. Faithfull's manager François Ravard said Saturday in a statement that the 73-year-old singer-songwriter, actress and muse is "stable and responding to treatment." A post from performance artist and Faithfull's longtime friend Penny Arcade offered additional details, mentioning that Faithfull has been receiving medical care since Tuesday.