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The reality star tragically died on Friday aged 38, just weeks after checking into a private hospital using £65,500 funded by friends and fans.
It was there that Pete had visited Nikki - sharing a sweet picture on his Instagram - which he captioned: "Pete and Nikki March 2021, visiting my Nikki and still cuddling to this day :)(sic)".
Nikki and Pete met on Big Brother season 7 in 2006, and dated for around a month after appearing on the show.
Despite their romance ending, they remained good friends in the years afterwards.
Following the news of Nikki's passing, Pete also shared an emotional video on Instagram honouring his friend. (You can watch this by viewing the clip at the top.)
"Hey guys... um, Nikki, yeah. I just wanna say thank you for all your support and love since the fundraiser came out," he said in the footage.
"The amount of love and support for Nikki was really amazing. Heartwarming was a good word for it, and I thought to myself, yeah we could save her. But [sighs, and starts to cry], yeah we didn't.
"But its ok, she's in a good place and she'd not suffering any more. So I'd just like to raise a glass, or a f*cking bottle more like, for Nikki Grahame, and all the love from us at Big Brother 7."
Through tears, while raising a wine bottle in the air, he added: "We really love you Nik. We really love you Nik, man. You were a true winner, man.
"You know, you were great. You f*cking rocked it babes. And, er, yeah, just wanna say we'll miss ya babe. Safe man, see ya later Nikki. Bye."
Alongside the video, Pete touchingly wrote: "R.I.P Nikki. Thank you for Carly Cunningham and Leon for starting the Amazing Nikki fundraiser, sadly earlier today I found out she just passed away from anorexia.
"Im gutted, we have lost a true character, my bb7 posse feel like we've lost a family member, our series just wouldn't of been the same without her!
"Even through our ups and downs we have still remained close through the years, and it was so nice to visit again recently with my girlfriend, sing Kate bush songs and have fun like the good old days! I'm just sad that it was the last song we ever sang.
"Thank you for the memories my friend, you will sorely be missed, I hope you're not hurting anymore and finally at peace
"I'll see you in heaven Nikki. Lots of love Pete Xxx".
It comes after Nikki's death was announced on Saturday, on her GoFundMe, which had been set up to support her private hospital stint.
A statement read: "It is with great sadness, we have to let you know that our dear friend Nikki passed away in the early hours of Friday 9th April.
"It breaks our hearts to know that someone who is so precious was taken from us at such a young age. Nikki not only touched the lives of millions of people, but also her friends and family who will miss her immensely.
"We would like to request privacy at this difficult time, while Nikki's friends and family process the sad news.
"Full details will be released as and when we know them."
Nikki had battled with anorexia since she was a child, with her mother, Sue Grahame, recently confirming that lockdown had made her condition worse, during an interview on This Morning.
RIP Nikki, you'll be missed.
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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