Rebecca Adlington and Beth Tweddle have BOTH suffered serious injuries, meaning they can no longer take part in the C4 skiing series.
Olympic swimmer Rebecca, 26, dislocated her shoulder after falling painfully during training for the air jump last week.
She was rushed to hospital at the time, and doctors have told her she can no longer compete.
In a statement, she says: "I have loved my time on the show, and I'm so sad to be leaving on injury.
"I'm so proud of myself with the challenges I have overcome, from skeleton to jumping and learning how to ski. I'm very grateful to have met the most incredible people as well. It was so difficult but so much fun at the same time."
Heather Mills has been announced as her replacement. She competed on The Jump in 2015 and left in the third week.
The TV personality, who wears a prosthetic leg, says: "I am overjoyed to be asked back by Channel 4 to join the competitors on The Jump, as I always felt it was unfinished business.
"I know I can do much better, and I am working with my prosthetist to create a foot that has more movement like a human's. I love that I have the opportunity to compete on a more level playing field, if you can ever call one leg against two level playing.
"However, I always love to challenge people's perception of disability and how one can overcome adversity."
Olympic gymnast Beth, meanwhile, hurt her back when she collided with a barrier after a tricky jump in training. She became the third contestant to withdraw from The Jump.
The 30-year-old was airlifted to hospital after the incident, and forced to pull out.
Rebecca and Beth's withdrawal comes after Tina Hobley, 44, departed after dislocating her elbow. She's been replaced by The Wanted's Tom Parker. A replacement for Beth has not yet been announced (but whoever they are, they are VERY brave).
Louisa Lytton was the first celebrity eliminated last weekend.
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