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Shania Twain

Denise Truscello/WireImage.com

Shania Twain is a married woman…once again. 

Shortly after announcing their engagement, the 45-year-old Canadian country-pop superstar and her Swiss business exec beau, Frédéric Thiébaud, wed Saturday in an intimate ceremony in Rincon, Puerto Rico. 

But there's an ironic twist to Twain's blissful nuptials….

The newlyweds began dating after their respective spouses left them to be with each other. 

So what went down? 

Back in 2008, Twain's hubby of 14 years, Grammy-winning producer Robert "Mutt" Lange, left her for Thiébaud's then-wife (and Twain's BFF) Marie-Anne Thiébaud. The devastated duo turned to each other for solace following the split. 

And the rest, as they say, is history. Congrats!