The 78-year-old was emotional but delighted after being shown a montage of her character Rita Sullivan's best bits on the cobbles.
Knox, praising the daytime show's team, commented: "That was wonderful. It's my life, isn't it? Gosh, that was beautiful. All those lovely scenes. To link them all together like that, it's beautiful what you've done."
Explaining why she rarely does live TV interviews, she continued: "I think this is the first! I'm not very good at them. Some people are very good and they can chatter and say all sorts and be entertaining, but you've seen I've just blubbed!"
The actress was appearing on the show to promote Rita and Dennis's wedding episodes, which air next week to coincide with the Queen's Diamond Jubilee celebrations. Knox confirmed that she was keen to be heavily involved in the preparations for the big day.
She said: "I thought, being given this marvellous story - once in a lifetime - I would treat it as if I was getting married. People out there will appreciate what you're like - you want the dress to be right, the hat, the shoes, the flowers, the jewellery, everything. I went all the way through it and had a terrible time trying to find shoes!"
"Phil Collinson, our producer, he's worked this so brilliantly," she continued. "From bringing Philip Lowrie back to play Dennis, to getting this marvellous story for the Jubilee. And another Tanner in the street - isn't that brilliant?"
Knox also reflected on her early days at Coronation Street, confessing that she was "terrified" to be working alongside the likes of Pat Phoenix, Doris Speed and Violet Carson.
She admitted: "They were marvellous and terrifying. 'Don't sit on that chair!' - one of those situations. But they were brilliant people, excellent actors, actresses and I learned a lot from them.
"I was terrified of them. I was absolutely terrified, because they hadn't had a younger person in it for a while, so I came in to find these wonderful, glorious people who were feted by the nation, they couldn't move they were so admired and loved.
"I could not accept they were actors and I just lost my voice. I couldn't speak, it was sheer nerves. However, they were very kind and helped me an awful lot and we became great friends - they were wonderful."
Coronation Street airs Rita's wedding day on Monday (June 4) at 7.30pm and 8.30pm on ITV1.
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Photo gallery - On-location shots from Rita and Dennis's wedding: