Jessie J surprises passers-by at St Pancras with performance

The singer was accompanied by a pianist.

Singer Jessie J surprised passers-by as she performed at St Pancras International station on Tuesday.

The 37-year-old, whose real name is Jessica Cornish, was accompanied by Geoffrey James on the piano.

Crowds watched on as she sang, some smiling and recording the performance on their phones.

It comes after the mother-of-one announced in June that she had been diagnosed with early breast cancer, with her first surgery taking place some weeks later.

In August, she revealed she had to undergo a second round of surgery before the end of the year, and postponed her upcoming tour.

Last month, Jessie J shared a hug with the Princess of Wales after the Royal Variety Performance, which the singer said was prompted by their shared experience of cancer.