Talking about the moment the former 'Gladiators' star popped the question, Kelly told Hello! magazine:"I saw this beautiful diamond ring and I think my first reaction was, 'Are you sure?'
The model and actress also talked wedding plans, saying she has turned to fashion designer friend Suzie Turner to help with her dress.
"I never thought I was going to be that girl who wants the huge dress with a 10-foot train," she said. "But now I want the biggest, most gorgeous dress ever.
And Kelly also admitted she's as surprised as everyone else about how quickly things are moving with David.
"I think it took both of us by surprise, to be honest, how quickly things have progressed," she said.
"But I've never met a guy like David before and although it seems soon to be planning our wedding, there's nothing to wait for in my mind because at the moment everything's fantastic and there's no reason why it can't continue to be like that."
One person who won't be getting an invite to Kelly and David's nuptials is Chantelle Houghton, who has hit out at the pair, accusing the model of being “attention-seeking” on Instagram.
Kelly shared a snap of herself and the former ‘Gladiator’ star with the caption: “Look how happy my husband looks”, a move which enraged the former 'Big Brother' star.
Writing in her new! magazine column, Chantelle said: “What was the point of Kelly Brook suggesting she and David McIntosh, aka Tornado, got married last week by calling him “my husband” on Instagram?
"It’s so cringey and the only explanation I can think of is that she was attention-seeking.”
Read the full interview with Kelly in the latest edition of Hello! Magazine, out now.