Former Little Mix star Jesy Nelson has reportedly ended her engagement to musician Zion Foster just weeks after revealing the devastating news that their eight-month-old twin daughters have been diagnosed with Spinal Muscular Atrophy (SMA) Type 1, the most severe form of the rare genetic disorder. The couple, who shared four years together and welcomed identical twins Ocean Jade and Story Monroe Nelson-Foster in May 2025, have decided to part ways romantically but remain committed to co-parenting their girls through what promises to be a challenging lifelong journey.
Sources close to the pair confirmed the split to multiple outlets on January 19, 2026, emphasizing that the separation is amicable. “She and Zion remain friends and are fully focused on their daughters,” a source told The Sun. “They are fully united in co-parenting. Their priority continues to be the well-being of their daughters.” The news has shocked fans, many of whom have expressed heartbreak over the timing, with Jesy, 34, now facing the primary caregiving responsibilities alone during one of the most difficult periods of her life.
Jesy and Zion’s love story began in 2022 after years of friendship, blossoming into a romance that seemed destined for longevity. The couple announced their pregnancy with identical twins in January 2025, a joyous revelation that quickly turned high-risk when the babies were diagnosed in utero with twin-to-twin transfusion syndrome (TTTS), a rare complication where blood flows unevenly between twins sharing a placenta. Jesy underwent emergency surgery and spent months under close medical supervision before giving birth prematurely at nearly 31 weeks in May 2025. The twins spent weeks in the neonatal intensive care unit (NICU), battling early health issues, but were eventually discharged home.
Just four months after their birth, in September 2025, Zion proposed during a romantic sunset beach getaway, with Jesy sharing the moment on Instagram, captioning a photo of her sparkling diamond ring: “Just got engaged to my best friend.” The couple appeared blissfully happy, collaborating on music and building their family.
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However, concerns about the twins’ development began to surface after they left the hospital. Jesy’s mother, Janice, first noticed limited leg movements, prompting further investigations. What followed was a grueling few months of appointments, culminating in the heartbreaking diagnosis of SMA Type 1 earlier this month. SMA is a genetic neuromuscular disease that causes progressive muscle weakness by destroying motor neurons in the spinal cord. Type 1, the most severe, typically presents in infancy and, without early intervention, can lead to life expectancy of around two years. Symptoms include floppy limbs, difficulty swallowing, breathing problems, and inability to achieve milestones like sitting or holding up the head.
In an emotional Instagram video posted on January 4, 2026, Jesy opened up about the diagnosis: “After the most gruelling three or four months and endless appointments, the girls have now been diagnosed with a severe muscular disease – SMA Type 1.” She explained that doctors at Great Ormond Street Hospital informed them the twins “will probably never walk, probably never regain their neck strength, so they will be disabled… They are gonna be in wheelchairs.” Despite the prognosis, Jesy remained defiant: “There’s been so many stories where parents have been told this and then their children have gone on to do incredible things, so I believe that you’ve just got to manifest that into existence. I truly believe that my girls will defy all odds.”
The twins have already received groundbreaking treatment—a one-off gene therapy infusion approved by the NHS that replaces the missing SMN1 gene responsible for the condition, halting further muscle deterioration. However, any motor neurons already lost cannot be regained. Story requires a breathing machine at night, and Ocean has needed a feeding tube. Jesy has described her home as resembling a hospital ward, lamenting, “I just want to be their mum, I don’t want to be a nurse.”
Zion, 26, has been equally vocal in his support. Days before the split was confirmed, he shared a poignant poem dedicated to his “two little warrior girls,” writing: “They said it’s unlikely you’ll walk, you may not be able to talk, probably won’t be able to hold your head up… I hear strength in your lungs every time you cry… My worry is quieter than that, deeper. It’s about accepting you, loving you for who you are right now, without conditions.” He praised Jesy as “the definition of a superwoman” for campaigning to add SMA screening to the NHS newborn heel-prick test, adding: “We are all one.”
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Jesy appeared solo on ITV’s This Morning shortly after the diagnosis announcement, notably without her engagement ring—a subtle clue that fueled speculation before the split was official. Tearfully, she revealed her guilt over missed early signs, which were dismissed due to the twins’ prematurity: “I potentially could have saved their legs if I’d caught it earlier.” She has launched a petition urging the government to include SMA in routine newborn screening, a simple blood test that could change outcomes dramatically if administered at birth. “If this is caught from birth, it’s just life-changing,” she stressed. Currently, England does not screen for SMA (though Scotland plans to start in spring 2026), meaning around 33 babies a year could face lifelong disability without early detection.
The strain of such a diagnosis on a relationship cannot be understated. Experts note that parents of children with disabilities face heightened risks of separation due to exhaustion, emotional toll, and shifting dynamics. While no specific reason for the split has been disclosed—insiders insist there was no “foul play”—the timing suggests the immense pressure may have contributed. Fans have flooded social media with support, praising both Jesy and Zion for their grace amid adversity. Many highlight Zion’s continued involvement, sharing photos of the smiling twins and vowing to fight alongside Jesy.
Jesy, who rose to fame winning The X Factor with Little Mix in 2011 and left the group in 2020 citing mental health struggles, has long been open about life’s battles. Her upcoming Prime Video documentary, Jesy Nelson: Life After Little Mix, set for release on February 13, 2026, was filmed last year and will chronicle her path to motherhood—now taking on added poignancy.
As Jesy navigates single parenthood with two children facing profound challenges, her resilience shines through. “They are still smiling, they’re still happy. They have each other,” she said of her twins. With treatment stabilizing their condition and both parents united in love for Ocean and Story, there is hope these little warriors will indeed defy the odds. Jesy’s campaign for newborn screening has already garnered massive support, potentially saving countless families from similar heartbreak.
In a world quick to judge celebrity splits, this one feels profoundly human—a reminder that even in the spotlight, some burdens are carried in silence. Jesy Nelson may have lost her partner, but her fight for her daughters has only just begun.
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