The 49-year-old presenter is soon set to appear on Channel 4's Celebrity Gogglebox alongside Judge Rinder.
Judge Rinder, real name Robert Rinder, came on GMB today to talk about their stint on the show.
And Piers couldn't help but comment on Susanna's outfit as a clip was shown.
In the Gogglebox clip, Susanna wore a short leopard print dress with bare legs, and Piers remarked: "I couldn't get past her legs... the leopard skin leotard and these bare legs..."
Susanna shot back, putting Piers in his place by saying sarcastically: "It's amazing isn't it... I've got legs."
The presenting duo were discussing Susanna's involvement with Celebrity Gogglebox at the start of today's GMB.
Susanna admitted that she was concerned about doing the show as she's used to doing live television.
Susanna revealed she had to watch "hours and hours" of TV for the show, before sharing her concerns about having "no control over the editing".
She explained: "You see, the benefit of doing a live programme is you're always in control of what you say and what goes out.
"When you do a recorded programme, it's in the hands of the editors."
Piers chipped in, saying: "And as our friend Eamonn [Holmes] found out, the editing can be a bit savage, the editing process as they apologised to him."
Eamonn said he was "hurt beyond belief" that his emotional discussion about his dad's death was replaced with "a funny story" on Celebrity Gogglebox.
Good Morning Britain airs weekdays at 6am on ITV