© BBC
Grant and Flavia Cacace stunned the judges with their camp and elaborate performances in the first two shows of the series, picking up an impressive 25 points for their salsa last weekend.
Speaking on It Takes Two, the former TV-am star claimed that he is getting so involved and passionate about the show that he finds himself dancing in unusual places around the home.
"I bashed into my old dad the other night at three in the morning coming out of the bathroom," he told host Zoe Ball.
"I was doing a small salsa. I came out and said, 'oh sorry dad' and sashayed off."
Grant added: "At four in the morning I had the World Service on and then I felt the duvet moving. I thought, what's going on here? It was my feet!
"My feet were doing what Flavia had taught me the day before."
Joking about his standing ovations from the studio audiences, Grant said: "I never know it's happening. I'm so grateful for this. I didn't come in this expecting standing ovations. I expected tolerance."
Grant and Cacace are dancing a foxtrot to 'Don't Rain On My Parade' for this weekend's Broadway-themed show.
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