United Kingdom, Oct. 28 -- Jessie J has been left "frustrated" after her second breast cancer surgery was delayed.

The 37-year-old pop star underwent an operation to treat early-stage breast cancer in June and she had been due to go under the knife for a second time earlier this month - even cancelling a number of two dates to give herself time to recover - but Jessie has now revealed the surgery was postponed by her doctors.

In a video posted on her Instagram page, she explained: "Some of you may know, some of you may not know, I was supposed to have a second breast surgery two weeks ago.

"So a week before my surgery I went to my surgeon and we discussed my surgery and it felt a little more complex than he was anticipating and referre...