The Big Reunion star made the heartfelt confession today, after he and the Good Morning Britain correspondent recorded an interview about their relationship for the breakfast show.
Adam, who first found fame in Coronation Street, tells the camera that he and Katy first met in 2011 after he began volunteering for an animal centre.
Katy had been invited along with other press to interview him about his work, and it's fair to say she stood out from the crowd!
In the video, Adam admits: "This little Fiesta turned up and out jumped this vision..my heart stopped.
"We did all the filming and I spent the whole day just absolutely obsessed with her. I actually did ring my mum that night and said, 'I've met the girl I'm going to marry'. I knew this was for the rest of my life."
Well Adam was right on the money, as he and Katy tied the knot in a private ceremony in North Yorkshire in December!
During their video, which was filmed especially for Valentine's Day, the couple also spoke about their first date.
Recalling the bar they visited after a romantic meal, Katy (who has taken her hubby's surname) turns to Adam says: "I just remember talking to you in that bar and feeling like there was not a single person in that entire room."
Adam adds: "It was a really busy bar and there weren't many tables, so we sat down next to a couple. We literally talked for five hours straight.
"At one point, Katy got up to go to the bathroom and the girl leant over and said, 'I'm so jealous of you two, you seem so in love'. I think we ruined that guy's relationship for him!"
Following their wedding, Katy and Adam enjoyed a romantic honeymoon in Thailand.
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