She opened up to Reveal about Mario's new flame, exclusively telling us that she thinks her brother and Becky are "very well suited."
Giovanna said: "They are really well suited and he's really besotted!"
Mario and Becky have been dating for several months now, and proving that things are getting pretty serious between the pair, Becky recently moved in with the former TOWIE star.
She has already met all of the family too, and among the loved-up selfies Mario has been posting to Instagram, he has also shared snaps of Becky with his nephews (and Giovanna's sons) Buzz, two, and Buddy, eight months.
We asked Giovanna if she thinks Mario's relationship with Becky could be the real deal for him this time round and, keeping coy, she said in response: "[Becky] seems to be really good for him."
Mario, meanwhile, has made no secret of his desire to settle down and start a family of his own some day. He is always seen spending time with his nephews and Giovanna told us that she thinks, when the time comes, Mario will make an "amazing dad."
Giovanna said: "He'll be a brilliant dad. If he's anything like our dad then he'll be absolutely amazing. He's a family man Mario, I don't think many people see that, but he is. He's here with us all the time and the kids absolutely adore him."
"He's always been like that actually," she added. "Wherever we go and there's children, Mario will always be the one climbing the climbing frame, he gravitates towards [the kids] and starts climbing."
Speaking about having a family of his own, Mario told Reveal in the past: "It will happen when it happens. I would love to have that, but I don't want to rush into something with the wrong person."
Perhaps, he's now found the right one?
Cadbury has teamed up with Giovanna Fletcher to create a film showing where the milk in Cadbury Dairy Milk Buttons comes from.
To watch the film go to Facebook.com/CadburyUK or tweet @CadburyUK.
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