Shania Twain had to come face to face with the ultimate betrayal in her marriage. In 2008, rumors swirled that Mutt Lange had been cheating on the country singer with her assistant, Marie-Ann Thiébaud. It's one thing for someone to cheat on their partner, it's another to cheat on them with someone they considered a close friend. Of course, this affair was alleged, as both Marie-Ann and Lange denied anything romantic happened during their marriages. However, Marie-Ann's husband at the time, Frédéric Thiébaud, has a different as to how things unfolded.

Frédéric shared in an interview that he had discovered his wife was cheating on him with Lange in a "concrete way." The businessman reportedly confronted the two about the affair and told them to tell the "You're Still The One" singer. When they didn't, Frédéric took things into his own hands and shared the jaw-dropping news with Twain. Whether the affair ended up being true or not, it took a toll on Twain and Lange's marriage as they decided to separate that same year.

Despite their constant denial about the affair, fans were even more convinced the affair took place because Lange and Marie-Ann decided to pursue a relationship following the separation from their respective spouses. Fans wondered if this newfound relationship was just a fling or something more serious. So, are Lange and Marie-Ann still together?

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