Ridge replied: Hey, beautiful girl, yes, our wedding tattoos. Muss u x."
Woman's Day reported the pair's closeness had caused Evans, a celebrity chef, to reconsider their engagement.
"Pete likes to be the alpha male, and he doesn't like it when his position as top dog is threatened - especially by a woman," an 'insider' reportedly told the mag.
The Daily Telegraph ran the story with the headline: "My Kitchen Rules judge Pete Evans' fiancee Nicola Robinson 'is already married ... to a woman'.
The reports will probably make the duo laugh, as they've been close friends for more than a decade.
Woman's Day reports Ridge and Robinson first formed a close bond in 2003 when introduced by their then husbands, Matthew Ridge and Eric Watson.
But their relationship was tested when Robinson began a two-year affair with Matthew Ridge.
When Sally Ridge's marriage with former cricketer Adam Parore ended in 2010, she spent time living with Robinson in the country.
"It was such a cool time for us," she told WD. "Nothing will ever, ever come between Nicky and me. No matter what happends. Even if I get grumpy at her, she gets grumpy at me or a man comes between us, it doesn't matter."
Evans has made news for other reasons recently, after being criticised over the release of his upcoming cookbook Bubba Yum Yum The Paleo Way - a book that includes paleo recipes for toddlers.
- nzherald.co.nz