The 50-year-old entertainment editor was telling viewers about Ranvir and Giovanni's upcoming Argentine Tango when he commented on the pair's relationship.
After showing a video diary of Ranvir explaining how rehearsals were going, he commented on the room the journalist was sat in.
He said with a cheeky smirk: "I'm sure I recognise that room. Possibly Giovanni's bedsit?"
Later in the show, Richard made another comment about the dancing duo's chemistry.
The journalist gushed: "You cannot dispute the sizzling chemistry between them."
In the video played by GMB, Ranvir told viewers: "So I've just got home from another day in training.
"It was a bit slower today.
"Bit tired, but we've achieved a lot already and I'm just hoping that by Saturday night for the Argentine Tango, I can bring out the energy, and the passion, and the drama of the story which is fantastic..."
Richard's comment comes amid rumours the Strictly pair are sharing a "romance".
Arnold isn't the only member of the GMB family to comment on Ranvir and Giovanni's passion.
Earlier this week, Susanna Reid gushed over their "romance" and claimed it would be a "blessing" if the pair got together.
The ITV host, who was partnered with Kevin Clifton on Strictly back in 2013, exclaimed: "It would be rather marvellous. It wouldn't be a curse it would be a blessing."
In an interview with OK! Magazine, Ranvir addressed the rumours as she said: "If I got hit by the curse, it would be a bl***y miracle!"
She exclaimed: "Oh my God, that would be hilarious. Do you know most of the dancers were born in 1990 or something? I'm old enough to be their mother.
"It's very optimistic and complimentary that anyone would think I would be struck by the curse", the journalist added.
Good Morning Britain airs weekdays at 6am on ITV.