South Shields pop star Jade Thirlwall, of Little Mix, is part of the nine-strong team aiming to conquer the 19,000ft mountain in a bid to rise life-changing cash.
Yesterday saw the team arrive at the most remote part of the route, with the summit in sight for Friday.
Jade, who is joined by band mate Leigh-Anne Pinnock on the journey, is one of those who has been feeling the effects of altitude sickness as the conditions take their toll.
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The team hiked through the Alpine desert to Pofu Camp where they will be hoping to acclimatise after a tough few days on their journey.
Speaking on day four of the climb, Jade said: "The last two hours have probably been the hardest. Last night I was really, really sick, vomiting, I felt nauseous, had a bad tummy and a high temperature, I'm not sure if it was a bug or the altitude.
"Been taking tablets, didn’t sleep very well. Got a blister on my toe! It’s just one thing after the other! Woke up this morning, feeling a lot better, everyone’s in good spirits, and it’s all worth it for this amazing cause.”
Jade and her fellow celebs are following in the footsteps of Gary Barlow, Fearne Cotton, Chris Moyles and Cheryl, who were part of the original team taking on the climb 10 years ago.
They raised £1.5million for Comic Relief.
Red Nose Day takes place on Friday, March 15. You can donate to the Team Kilimanjaro climb here.