The 31-year-old shared the news on Instagram, revealing the extent of her symptoms.
She wrote: “So it’s not winter flu as I thought. I have f**king viral pneumonia. Winning at life. Wouldn’t wish it on anyone.
“Dryly coughing blood, bleeding sore ears, fever, shakes and aches, body almost to weak to hold its own weight, chest pains, shortness of breath, loss of appetite [sic].”
Fifi, who, unlike her famous sisters Pixie and the late Peaches, has shunned the limelight, opened up about her battle with depression this year.
Following Peaches’ tragic death, Fifi recalled the moment she realised she had depression.
She said: “I woke up crying about everything and nothing. I remember thinking what the f*** is going on in my head. Why do I feel like this?
“It’s confusing and it makes you feel quite lost within yourself. It wasn’t a slow and gentle descent into depression. Something totally switches in your mind.
“I’m still trying to work out what’s wrong with me now.”
We’re wishing Fifi a speedy recovery from pneumonia!