The pair are newcomers to the hit series on Netflix, playing Queen Elizabeth II and Princess Margaret respectively.
The 74-year-old singer has been building the model railway in his spare time for 26 years – even taking it on tour.
The singer has spoken out against claims there is a rift between her and dance partner Giovanni Pernice.
The rocker has created a huge model railway in his home in Los Angeles, complete with 5ft tall skyscrapers.
The 'This Morning' host could not contain her emotions as her therapist colleague Eva Speakman, shared her abuse hell.
The presenter was joined by stars including Nicole Scherzinger, Craig David and Rick Astley.