The 33-year-old, who recently gave birth to twins prematurely, will star in a new six-part docuseries Jesy Nelson: Life After Little Mix on Prime Video.
The singer, 33, wore a white shirt left unbuttoned over a white bra and underwear set, displaying her bare belly, as she proudly held up ultrasound photos of her unborn twins.
The singer, 32, shot to fame in 2011 when she appeared on The X-Factor and was placed into girl group Little Mix alongside Jesy Nelson, Perrie Edwards and Leigh-Anne Pinnock.
The Little Mix star, 34, has been in hospital since late March after being diagnosed with twin-to-twin transfusion syndrome (TTTS) - a rare condition that can put one or both babies at risk.
And among those on the starting line were Joel Dommett, Kelly Brook, Harry Judd and Adele Roberts, who took to their social medias ahead of the race to voice both their excitement and nerves.
The Little Mix star, 34, revealed earlier this week that she's been diagnosed with pre-twin-to-twin transfusion syndrome, meaning one or both babies could be at risk of death.