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Tributes to Nikki have been flooding in ever since, including a heartbreaking clip of Nikki's ex-boyfriend and fellow Big Brother star Pete Bennett, who shared an emotional tribute to his friend online.
Ever since, fans of the couple have been reflecting on Pete and Nikki's love story as one of (if not the) most iconic Big Brother couples in history.
One person tweeted: "So sorry to hear about Nikki - one of the greatest Big Brother housemates. Yes, she became iconic for the catchphrase but she also had such a sweet relationship that summer with Pete."
While another added: "Pete Bennett's Instagram video for Nikki Grahame is genuinely heartbreaking. Their relationship was so wonderful."
Although Nikki was a Big Brother legend in her own right - with infamous lines including 'Who IS she?!' and 'FOUR bowls of cornflakes!', viewers were also drawn to her mega cute relationship with Pete.
Pete and Nikki won the hearts of the nation when they met on season seven of Big Brother back in 2006. Mates at first, their relationship soon blossomed, with the pair always spotted cuddling and supporting each other.
Their relationship was so cute, and fans have been reminiscing on some of their favourite moments, including the episode in which Nikki returned to the BB house for the final week, and was reunited with Pete (who went on to win the show).
Although the couple were only together for around a month, they remained best mates, and when Nikki appeared in a later season of Big Brother in 2015, Pete was drafted in to surprise her during a shopping task.
She wasn't allowed to move or speak in the task, but she was beaming at his arrival.
Over the years, the pair remained friends, reuniting on screen once again in 2016, during an episode of Loose Women. And when Nikki's fundraiser was shared last month, in a bid to raise money for her hospital treatment, Pete shared the link on his own page as well as a photo of the pair.
"Pete and Nikki March 2021 visiting my nikki and still cuddling to this day :)," he wrote. "Remember the fundraiser to help get her into a specialist anorexia clinic is in my bio!"
The fundraiser for Nikki was started last month by friends, in a bid to raise funds for Nikki's hospital treatment.
On Saturday, an update was shared to the page, announcing the tragic news that Nikki had sadly passed away.
Nikki's mum, Sue, had appeared on ITV's This Morning just weeks before, speaking of her daughter's struggles with anorexia throughout lockdown.
"Last year really put the cap on [her eating disorder, but] when the gyms closed it was quite a worry," Sue said.
"The isolation... it's been really hard for her, really hard. She felt very cut off and spending too much time on her own with not enough to think about other than food and, that took a grip as well."
Our thoughts are with Nikki's family and friends.
If you, or anyone you know, has been affected by an eating disorder, you can find help and support at eating disorder charity, Beat.
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