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The actor has played Sally Webster in the ITV soap for 35 years and is also the mother of Bridgerton star Phoebe Dynevor.
Dynevor, 58, was named as the first contestant for the new series on Lorraine on Monday morning.
She joins a long list of stars swapping the cobbles for the ice, with her on-screen daughter Brooke Vincent having taken part previously as well as Samia Longchambon, Jane Danson and Antony Cotton, and admitted she'd broken the news to them before the official announcement.
The soap star said: "I know I shouldn't have done this but on Friday I set up a little WhatsApp group with all the Corrie ice skaters and I told them because I didn't want them to find out through the press, I wanted to tell them myself."
Adding that her co-stars had been guessing who her partner would be, she said: "Anyone who's done Dancing On Ice who can give me any advice, I'll just soak it up because I really need it."
Dynevor, who said she couldn't wait to meet Jayne Torvill and Christopher Dean on the show, revealed the extent of her skating experience.
She said: "I went with (daughter) Hattie when she was little and I had a penguin and thought this is too hard and so I'll go and get a coffee.
"I'm not getting any younger so I've just got to take every opportunity I can get so when I'm older I can say I gave it a go.
"I'm not competitive or anything, I just want to do this for myself just to give me a bit of confidence and do something different."
Adding that she'd been asked to take part many times before, she said: "I'm 58, if I don't do it this year I'm never going to do it. It's completely out of my comfort zone and I'm absolutely terrified...but I've just got to try and enjoy this experience."
She said: "I'm not saying I'm going to be good, I'm just having a go."
This year's contestants will need nerves of steel to take part in the show as Dancing On Ice 2021 saw the highest number of drop outs due to injury or illness that the competition had ever seen.
Denise Van Outen had to quit with a dislocated shoulder, Billie Shepherd was concussed, Jason Donovan suffered a back injury, and Rufus Hound and Joe-Warren Plant both tested positive for COVID.
Pro skaters had a tough series too, with Hamish Gaman suffering a finger injury and Yebin Mok had to have surgery after her partner Graham Bell accidentally stabbed her in the leg with his skating blade.
Watch: Dancing On Ice winner Sonny Jay poses with trophy in London