The host agreed to step into his shoes "as a favour" after a troubling year following Ant's drink-drive conviction.
She has been welcomed into the I'm a Celeb family, with a new picture revealing her name on the back of a chair on set.
She will be seated to the right of Dec, where Ant would normally sit.
Holly will have to remember to always stay on this side of Dec, despite having a more relaxed on-screen order with her This Morning host Phillip Schofield.
But medic Bob thinks she'll be more focused on the critters surrounding her in the jungle – because she's scared of everything.
He said: “Holly’s more scared than all the celebrities put together, I’m not joking. All I have to do is talk to her and look at the floor and she goes ‘What’s on the floor? What are you looking at the floor for?’
"When they do the trials I think they need a camera just on Holly because she’ll be squirming."
Holly has been spending the last week rehearsing Sunday's script as the show launches its first show of the new series.
Dec broke the ice with fans on Monday when he joked about pal Ant "looking well" as he posted a picture with Holly.
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He told fans: "Ant’s looking well don’t you think!? I’m joking of course, Holly and I are looking forward to welcoming you to Australia next Sunday night. D."
Ant, 42, has stepped down from this year's series to focus on his recovery, leaving Holly to keep his seat warm as Dec’s jungle co-host.
The pair have been spending time together before the launch of I'm A Celebrity on November 18th to build up their chemistry with practice read-throughs.
Holly said: “I’m just getting used to how the scripts run. So it was a script for a fake show.
“There’s just a lot to get my head around. I’ve been doing This Morning for nine years and there’s such a rhythm to it.
“And to suddenly do something that’s already got its own pattern and is already established, it’s going to take a bit of getting used to.”
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