But who is Adam Woodyatt and what is he best known for?
Over the coming days, the campmates will be getting to know actor Woodyatt a little better, who viewers will recognise as EastEnders character Ian Beale.
The 53-year-old has played the role for more than three decades and is the BBC One soap's longest-serving cast member, but is currently on an extended break from Walford.
Speaking about why he'd chosen to enter the castle, the soap star said: “I don’t mind if I am first or last in the castle – I am just really looking forward to being on the show.
“Why have I finally said yes? Because I am not in EastEnders! That is the honest answer. I am not in contract with the BBC so I can come and do it. Everyone thinks I am Ian Beale and so it’s going to be great to show I am not.”
Ian's most famous storylines have included being married six times to five women, becoming homeless, and his young son Bobby Beale being responsible for a whodunnit shooting.
The actor split from wife Beverley, who he has two children with, in 2019 after more than 20 years of marriage.
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Since taking a break from EastEnders, he has spent time travelling the UK in his motorhome and even put in a few shifts on his friend's burger stall, surprising customers.
Talking about his hopes for life after I'm A Celebrity, Woodyatt said: "I might take the summer off and go and work at my mate’s restaurant when he does the pop up stalls at food festivals. I did it a couple of times this summer and I enjoyed it.
"But I am just now really looking forward to doing I’m A Celebrity. Programmes like this were a blessed relief during the lockdowns last year and I can’t wait to go in.”
Watch: Adam Woodyatt and Simon Gregson tackle latest I'm A Celeb trial