Lesson for Shania Twain: Your paid assistant is not actually your BFF.
On "Watch What Happens Live," host Andy Cohen asked the country singer what she would say to her former "best friend," Marie-Anne Thiebaud.
Twain replied, "I wish I'd never met you."
She continued: "That would be it. You panic in those situations, you don't know what to do. I think there are some people in life you would say, 'I would have been better off not ever knowing that person.'"
Thiebaud had an affair with Twain's husband and chief musical producer Robert "Mutt" Lange, which ended their 17-year marriage in June 2010.
After that split, Twain started a relationship with Thiebaud's husband Frederic Nicolas Thiebaud. Twain married Frederic in January 2011.
As much as it might sound like it, Twain is not bitter. "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," she said to Cohen.
Twain just announced her final tour.
Shania Twain Style
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Singer Shania Twain arrives at the 48th Annual Academy of Country Music Awards at the MGM Grand Garden Arena in Las Vegas on Sunday, April 7, 2013. (Photo by Al Powers/Invision/AP) (credit:AP)
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LAS VEGAS, NV - DECEMBER 01: Singer Shania Twain performs during the debut of her residency show 'Shania: Still the One' at The Colosseum at Caesars Palace on December 1, 2012 in Las Vegas, Nevada. (Photo by Jeff Bottari/Getty Images) (credit:Getty Images)
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LAS VEGAS, NV - NOVEMBER 14: International superstar Shania Twain rides up the Las Vegas Strip on horseback to greet fans on to The Colosseum at Caesars Palace on November 14, 2012 in Las Vegas, Nevada. SHANIA: STILL THE ONE debuts December 1, 2012. (Photo by Michael Buckner/Getty Images for Caesars Palace) (credit:Getty Images)
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LAS VEGAS, NV - NOVEMBER 14: International superstar Shania Twain speaks to fans after riding up the Las Vegas Strip on horseback to greet fans on to The Colosseum at Caesars Palace on November 14, 2012 in Las Vegas, Nevada. SHANIA: STILL THE ONE debuts December 1, 2012. (Photo by Michael Buckner/Getty Images for Caesars Palace) (credit:Getty Images)
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NASHVILLE, TN - JUNE 10: ***EXCLUSIVE COVERAGE*** Singer/Songwriter/Author Shania Twain joins 'Oprah' Audience during Brunch and then signs over 400 copies of her book 'From this Moment on' during the Audience's Surprise Trip To The 2011 CMA Music Festival. Brunch held at the Gaylord Opryland Hotel on June 10, 2011 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images) (credit:Getty Images)
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NASHVILLE, TN - JUNE 08: Singer Shania Twain attends the 2011 CMT Music Awards at the Bridgestone Arena on June 8, 2011 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for CMT) (credit:Getty Images)
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HOLLYWOOD, CA - JUNE 02: Singer Shania Twain is honored with the 2442nd Star on the Hollywood Walk Of Fame on June 2, 2011 in Hollywood, California. (Photo by Jason Merritt/Getty Images) (credit:Getty Images)
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NEW YORK, NY - MAY 05: Singer Shania Twain visits the Apple Store Soho on May 5, 2011 in New York City. (Photo by Dimitrios Kambouris/Getty Images) (credit:Getty Images)
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TORONTO, ON - MARCH 27: Singer Shania Twain poses on the red carpet at the 2011 Juno Awards on March 27, 2011 in Toronto, Canada. (Photo by Jag Gundu/Getty Images) (credit:Getty Images)
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NEW YORK - DECEMBER 08: Singer Shania Twain attends the launch of VEVO, the world's premiere destination for premium music video and entertainment at Skylight Studio on December 8, 2009 in New York City. (Photo by Dimitrios Kambouris/Getty Images for VEVO) (credit:Getty Images)
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NASHVILLE, TN - NOVEMBER 12: Singer Shania Twain presents the award for Entertainer of the Year on stage during the 42nd Annual CMA Awards at the Sommet Center on November 12, 2008 in Nashville, Tennessee. (Photo by Scott Gries/Getty Images) (credit:Getty Images)
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NASHVILLE, TN - NOVEMBER 12: Singer Shania Twain attends the 42nd Annual CMA Awards at the Sommet Center on November 12, 2008 in Nashville, Tennessee. (Photo by Bryan Bedder/Getty Images) (credit:Getty Images)
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LAS VEGAS - MAY 15: Singer Shania Twain arrives at the 42nd Annual Academy Of Country Music Awards held at the MGM Grand Garden Arena on May 15, 2007 in Las Vegas, Nevada. (Photo by Michael Buckner/Getty Images) (credit:Getty Images)
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LAS VEGAS - MAY 15: Singer Shania Twain presents the 'Entertainer of the Year' award onstage during the 42nd Annual Academy Of Country Music Awards held at the MGM Grand Garden Arena on May 15, 2007 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) (credit:Getty Images)
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WASHINGTON - DECEMBER 3: Singer Shania Twain poses at The 29th Annual Kennedy Center Honors December 3, 2006 in Washington, DC. (Photo by Nancy Ostertag/Getty Images) (credit:Getty Images)
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NEW YORK - NOVEMBER 15: Singer Shania Twain attends the 39th Annual Country Music Association Awards at Madison Square Garden November 15, 2005 in New York City. (Photo by Evan Agostini/Getty Images) (credit:Getty Images)
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NEW YORK - NOVEMBER 15: Singers Shania Twain and Billy Joel present the award for Entertainer Of The Year at the 39th Annual Country Music Association Awards at Madison Square Garden November 15, 2005 in New York City. (Photo by Scott Gries/Getty Images) (credit:Getty Images)
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NEW YORK - NOVEMBER 13: Singer Shania Twain attends the premiere of 'Walk The Line' at the Beacon Theater November 13, 2005 in New York City. (Photo by Paul Hawthorne/Getty Images) (credit:Getty Images)
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HAMBURG, GERMANY - NOVEMBER 18: Shania Twain performs at the Bambi Awards 2004 at the Theater im Hafen on November 18, 2004 in Hamburg, Germany. (Photo by Sean Gallup/Getty Images) (credit:Getty Images)
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NASHVILLE, TN - NOVEMBER 9: Shania Twain appears on stage at the 38th Annual CMA Awards at the Grand Ole Opry House November 9, 2004 in Nashville, Tennessee. (Photo by Frank Micelotta/Getty Images) (credit:Getty Images)