The unlikely couple – who leaped into the air from a Big Apple yellow taxi – were helping launch a campaign by movie channel TCM inviting members of the public to recreate their favourite film scenes and upload their efforts to the channel's website.
Denise, still looking trim after having climbed Mount Kilimanjaro for Comic Relief earlier this year, said she loved Fame. "It's is a real classic, but essentially for me it's a dance musical and - because the Eighties are making a big comeback – has great outfits."
Johnny – who described his dancing as "a rough interpretation of rhythm" added jokingly: "I expect the West End will be beating my door down after this so I'm just going to take a bit of time and consider the roles I'm offered. Possibly do a bit of work-shopping with Richard Gere, (in reference to the Hollywood star's musical turn in Chicago) and take it from there."