United Kingdom, Oct. 22 -- Lily Allen discovered a "f****** massive lump" on her right breast after undergoing cosmetic surgery earlier this year.

The 40-year-old singer discussed her recent breast augmentation and the events surrounding it in an interview with Perfect Magazine, saying she underwent the surgery in February, following her separation from actor David Harbour, 50, after four years of marriage -but reassured fans medical tests confirmed the growth is not cancerous.

Asked how she felt about the procedure, Lily said: "Good, although I have got a f****** massive lump in my right boob. I think it must be a cyst. Yeah. It's not dangerous. I went to have a mammogram and an ultrasound in New York last week and it came back OK."

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