United Kingdom, June 4 -- Jessie J has been diagnosed with "early" breast cancer - and she will undergo surgery later this month.

The 37-year-old singer took to social media to reveal she received the medical news before her new single, 'New Secrets', dropped on April 25th, and she has been "in and out of tests" since.

She said in an Instagram video: "Before 'No Secrets' came out, I was diagnosed with early breast cancer.

"I'm highlighting the word 'early'.

"Cancer sucks in any form but I'm holding onto the word early.

"I have been in and out of tests throughout this whole period."

Jessie went "back and forth" with herself about whether she should share her news, due to there being "lots of opinions outside".

But the 'Who You Are' ...