Shania Twain Discusses the Ex-Friend Who Had an Affair with Her Husband

— -- In 2008, Shania Twain split from her ex-husband, Mutt Lange, after she discovered he was having an affair with her then-best friend, Marie-Anne Thiébaud.

During an appearance on Bravo's "Watch What Happens Live," the singer revealed what she would say if she came face to face with her former pal.

"I wish I'd never met you," she said. "That would be it."

Twain, 49, who just announced her final tour, eventually found love with Thiébaud's ex-husband, Frédéric Thiébaud, whom she married in 2011.

"I think there are just some people in life you would say, 'I would wish I hadn't met this person or I would have been better off not ever knowing that person,'" she added. "But I can't say I would be better off because I think I learned a lot from all of that. I don't regret it!"