"Wow, that's pretty good," Harris said with a laugh as the former Dancing With The Stars contestant smiled awkwardly.
"I don't know about that," the 48-year-old journalist hit back, clearly unimpressed by the digitised version of her aged face. "I'm really not sure about that... not really sure about that.
"Where's that photo...? Oh, that's from a photo off Instagram or something. I don't know that you can take it from a photo of a photo of a photo."
In June, Harris opened up about Thorburn's new co-hosting gig on the Network 10 breakfast show, revealing she's genuinely trying to move on from her high-profile split from sacked Today show host, Stefanovic— who is now married to shoe designer Jasmin Yarbrough.
During an interview with KIIS FM's Kyle and Jackie O, Harris said the mum-of-three joined the show in the hope of reinventing herself.
"It must be very hard to front up and then always being questioned about your very famous ex-husband. She genuinely wants to move on," Harris insisted, before adding that Thorburn's experience as a divorced, single mum "brings this whole kind of new vibe" to the panel.