This after she shared a post on Sunday wishing her boyfriend a happy birthday.
Rosette captioned the loved-up post: "Today is the day you were brought into this world to be a blessing and inspiration to the people around you! You are a wonderful person! May you be given more birthdays to fulfill all of your dreams! Happy birthday my love."
The popular model originally tagged her bae - whose name is allegedly Nathaniel Oppenheimer (heir to the Anglo American/De Beers fortune) - but tweeps have slammed it A FAKE!
Not only did the Twitter detectives discovered that no such person exists, but they also revealed that that pics from Nathaniel Oppenheimer's account has actually been stolen from another Instagram account.
Naturally, Black Twitter had a field day with the news.
Some even accused Rosette - who split from her husband Lunga after he 'traded her' for younger model Rethabile Lethoko - of making the account up the account herself!
So who exactly is Rosette dating then? Somebody call Max & Nev!
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Image credit: Instagram @rosette_ncwana_