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March 04, 2015 11:20 AM

Country superstar Shania Twain announced a 48-city North American tour Wednesday, her first in 11 years – but she says it will be her last.

In an appearance on Good Morning America, Twain, 49, offered up the bittersweet news as she prepares to perform around the U.S. and Canada on her Shania Rocks This Country tour, which will kick off in June in Seattle.

“I’m finally going back on tour,” she told GMA‘s Robin Roberts in a live appearance.

“This is going to be a big tour for me because it’s going to be my last,” the Windsor, Ontario, native shared. “This is my last tour. I’m going to make the most of it. Let’s put it that way … I just really want to go out with a bang.”

And it looks like she just might get her wish: After news of the tour was announced, fans crashed Twain’s website on Wednesday morning, a rep confirms to PEOPLE.

Twain made her musical comeback after years off and away from the charts. Between 1993 and 2011, she sold more than 11 million albums worldwide. She lived in Switzerland for several years with then-husband Robert “Mutt” Lange, raising their son, Eja. They divorced in 2010, and she married current husband Frédéric Thiébaud in 2011.

Most recently, Twain wrapped a successful two-year residency in December at Las Vegas’s Caesars Palace, where she helmed her flashy Shania: Still the One show. She released a live CD and DVD from that show this week.

On her new U.S. tour, Twain will be joined for most shows by Gavin DeGraw, according to her website. Singer Wes Mack will move into that slot when she takes her road show to her native Canada.

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