Jessie J's cancer has not spread following her recent mastectomy

In a video posted on Instagram, Sky - Jessie's two-year-old son - says: "Mummy is going to be OK."

Jessie captioned the video: "And...I AM OK

"Results = I have NO cancer spread [tears emojis]

"Happy tears are real [tears emojis]

"Thank YOU for the prayers, the love, the well wishes, the joy and all the positive energy. [crying emoji] (sic)"

Jessie then provided some context to her son's video message.

She explained: "This video is from the night before my surgery . We called it baby boy. You are my biggest ray of light and with you in my life the darkness will never win. [clouds and sunshine emojis]

"Lots of healing to go and one more surgery to make these cousins look more like sisters. But for now it's gratitude time and I am changing my name to The LopJess monster (sic)"

Jessie first shared news of her cancer diagnosis via an Instagram post on June 3.

The chart-topping pop star admitted at the time that she'd been "going back and forth" over whether to share the news with the public.

She said in a video message: "I want to share it with my fans and the people that care about me, and also I'm a sharer. I've always shared everything that I go through in my life. 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 on to the word early. I have been in and out of tests throughout this whole period."

Jessie confessed at the time that she was still trying to process the news herself. However, she ultimately felt it was important that she shared the news with her fans.

The Price Tag hitmaker said: "I'm not processing it because I'm working so hard. I also know how much sharing in the past has helped me with other people giving me their love and support and also their own stories."