"You've done it", said Willoughby.
Redknapp, who had never watched the programme before entering the camp, said: "I'm amazed I survived three weeks".
The Torchwood star told the presenters: "There's no question, I've come this far - I'm not going to say no to anything now and this is the one I've always dreamed of doing". Jam roly poly's all round!'
Holly stepped into Ant's shoes after he chose to take time off to deal with his addiction issues.
Made In Chelsea's Georgia "Toff" Toffolo was crowned queen of the jungle previous year, Gogglebox star Scarlett Moffatt won the title in 2016 and Geordie Shore's Vicky Pattison in 2015.
Fans watching the ITV show thought the scenes were hilarious.
They have insisted they want Ant back. But she's been such a success that producers are now keen to keep her whatever happens.
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She said had been soul-searching and found "so many wonderful souls" as well as new-found love and respect for herself.
The insider also shared that bosses are set to present an offer to Holly by March next year.
Daily Star Online has contacted a rep for Ant for comment.
Ant was recently seen on old clips on Extra Camp, leading fans to beg for his swift return to his TV commitments.
He went on to brand her stand-in role as a "caretaker" stint, before quipping: 'Don't get too attached'.
Ant, 43, revealed in August that he would be taking a break from presenting duties for the rest of 2018, following his drink-drive arrest in March, his acrimonious divorce from wife Lisa Armstrong and his stint in rehab.