The 56-year-old presenter - who knocked Pamela Anderson out in the skate-off previously - said of his former competitor: "She's such a lovely lady. I was quite shocked actually. It was a shame she left.
"She went on about this wardrobe malfunction but I googled it and couldn't see it on YouTube. Everyone had a look! The only reason she left is because she stumbled. So regardless of how much money you're being paid, Cheggars is in!"
On the physical demands of the show, he said: "I've never done any exercise before DOI ever. I'm absolutely shattered. I've done my ribs in, I can't breathe, my back hurts! Last week I had a bug and was told to get off the ice.
"This week there's a new save-me-skate, a new routine, a team routine and an opening routine - I'm double the age of everyone else and I'm doing twice as much work! I'm going to have a coronary at this rate. I'm going to die!"
Having lost two stone, he said: "I went to the gym once before the show started, but I just stood next to fat people trying to look thin. On Sunday we've got Olly Murs coming on the show and my waist size has come down three inches. I can probably fit into Olly Murs's trousers. I'm really chuffed."
Astounded he's still in the reality show, he said: "Each week I'm at the bottom of the leader board. People who would want to vote for me don't know what the phone is! They think a mobile's a zimmer frame. I have the pink pound after me."
Talking about whether he'd strip off on ice - similar to his stint on 2000's Naked Jungle which saw him present a show nude on Channel 5 - he said: "I promised my mum I'd never take my clothes off again on tele. I will not be doing that, thank you!
"I'm still surprised people remember it. There's me thinking no-one will watch that rubbish. How wrong was I? I wish I'd never done it."
Working again with Ricky Gervais on a one-off special of Life's Too Short, he said: "I can't tell you, I'm so chuffed. I can't tell you how fantastic that is. I've got the best script writer in the world.
"That's a mega star phoning up Cheggars going, 'I've written something for you'. It's a one-hour special with Val Kilmer - and there's me, Les Dennis, Shaun Williamson and Warwick Davis. He calls us the Holy Trinity!
"He's brilliant. He doesn't stop laughing and he ruins your takes because he giggles throughout them. He hasn't played any tricks on us yet, but we're all waiting."
Keith admitted he was confused when Ricky first called him up. He said: "I have to admit the first time he ever phoned me up I thought it was impressionist Jon Culshaw. I thought it was a spoof!"
Keith is working with www.pchprizes.co.uk, one of the UK's largest free prize draw websites who have given away over £400,000 since launching back in September 2011. He will be taking to the streets in March to award the next big winner of the £100,000 prize draw! You can enter the prize draws daily online for free.