The pair came to blows over the saucy clip, which sees the brunette bombshell writhe around in her underwear while rubbing spaghetti over her body.
Model Emily claimed that the video was made to highlight feminism and empower women, which Piers took issue with.
However, Susanna disagreed and insisted that the 26-year-old should be allowed to strip off if she wants to.
“Well done Emily,” she remarked, before Piers snapped: “Susanna Reid, how shameless you are. The idea that someone likes you thinks that genuinely promotes feminism is nonsense.”
Unimpressed with her co-hosts comment, the 46-year-old clarified: “I don’t think that. I haven’t said that.
“I’m just standing up for Emily because I think you have a problem with Emily and everything she does, you have a go at her.”
Piers hit back: “I have a problem with her and Kim Kardashian when they frame this…”
But Susanna would not back down as she continued: “She is a spokeswoman for women’s health and a representative for planned parenthood.
“She is making a point about owning her own sexuality and saying she is in charge of it and not men.”
The broadcaster then demanded that the 52-year-old stop trying to interrupt her as she defended the model.
“Oh look another charge towards feminism, women wanting to talk,” Piers laughed. “I have no problem with her getting her kit off, I have a problem when she counts it as feminism and female empowerment.”