United Kingdom, July 7 -- Jessie J's cancer has not spread following her recent mastectomy.

The 37-year-old pop star has taken to social media to share a positive health update amid her ongoing cancer battle.

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...