Kate and Rio Ferdinand's BBC documentary is set to air next week and in a new trailer, Kate can be seen sobbing as she opens up about her role as a stepmum.
Speaking about her stepchildren, the 28-year-old becomes visibly emotional as she discusses family life during the new programme, Rio and Kate: Becoming a Stepfamily.
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In the clip, Kate can be heard explaining: "It is hard for us so I can't even imagine how hard it is for the kids."
"I just want the children to be happy," she continues, breaking down in tears.
The documentary follows Kate as she becomes stepmum to Rio's three children: Tate, Lorenz and Tia.
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Rio's late wife Rebecca Ellison passed away in 2015 aged 34, after being diagnosed with breast cancer for a second time.
The programme focuses on the challenges and triumphs of becoming a stepfamily - now the fastest growing family type in the UK.
Rio, 41, also speaks about the difficulties Kate and the kids have faced as they have adjusted, explaining: "There ain't no manual that tells you how to become a stepmum."
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As well as giving viewers a glimpse inside their life as a stepfamily, the documentary also follows the couple on the build up to their wedding, which took place in Turkey in September last year.
"[...] You feel like you've been dealt a terrible hand but, your luck can change," Rio adds.
Announcing the new documentary on Instagram, former TOWIE star Kate explained: "This is a hugely important and personal project for @rioferdy5 and I.
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"For the last year we have been filming a new @bbcone documentary 'Rio and Kate: Becoming a Step Family'.
"We have been on such a journey and we really hope the film will help other step families and those experiencing the journey of grief... coming soon."
The new BBC show isn't the first time Rio has opened up about his grief.
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In 2017, the dad was hailed a "warrior" after he spoke about his struggles in BAFTA-winning documentary, Rio Ferdinand: Being Mum and Dad.
The documentary showed the sports star juggling the challenges of being a parent and coming to terms with the loss of his wife.
The follow-up, Rio and Kate: Becoming a Stepfamily will air on BBC One on Monday 10th February at 9pm.
Featured Image Credit: BBCTopics: Entertainment News, Celebrity News, TV News