The controversial presenter was speaking about Susanna's interview and accompanying photoshoot in Stella magazine, in which she spoke of her difficult time at the start of lockdown.
Images from the magazine spread flashed up on the screen as the 49-year-old spoke, and Piers, 55, couldn't take his eyes off them.
He said: "Can we go back to that one? I am having some heart palpitations myself. Lovely. Gorgeous."
Susanna brushed off her co-host's compliments and explained that reporting about the pandemic on GMB was difficult for her.
"There was a sense of being overwhelmed by the fear of what was happening at the time," she said.
Speaking of her nightmares, she added: "I did find them quite distressing and I woke up with a sense of powerlessness that I couldn't help.
"We were here reporting on the pandemic and the stories were overwhelmingly upsetting because we were dealing with so much bad news and it was affecting so many people."
Susanna went on to say that while she had not been personally affected by coronavirus, her co-star Kate Garraway has, as her husband Derek Draper is still in hospital battling the effects.
She told viewers: "We are very concerned about that."
Piers opened up about his own experience with working throughout the pandemic, revealing he was struggling to sleep too.
He said that, previously, while he would have had a bit of a sleep after Good Morning Britain, he was unable to nod off so was surviving on just three or four hours of sleep a night.
The host said the first lockdown left the nation with the "fear of the unknown", but now people know what it's like, they are fearful.
Good Morning Britain airs weekdays at 6am on ITV