Kelly Clarkson performs during 97.3 Alice Summerthing

Kelly Clarkson performs during 97.3 Alice Summerthing at Sharon Meadow in Golden Gate Park on June 28, 2015 in San Francisco, California.  

Tim Mosenfelder/Getty Images

Kelly Clarkson has canceled her upcoming Canadian and U.K. tours on doctor's order.

The Grammy-winning singer was set to perform nine dates across Canada, starting Oct. 1 in the nation's capital, Ottawa, and concluding in Vancouver on Oct. 17. The six-date U.K. tour was set to begin Nov. 10 in Dublin at 3Arena. She already canceled some U.S. dates this month.

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"I am truly sorry that I have to cancel the remainder of my tour dates," read a statement posted to Clarkson's social-media accounts Friday (Sept. 25). "I was looking forward to sharing this tour with all my amazing fans in Canada and the U.K. Unfortunately my doctor is telling me I have to stay on vocal rest, but I am working hard to get better as fast as possible."

Clarkson's Piece by Piece tour -- named after her seventh studio album released back in February -- began July 11 at Pennsylvania's Hersheypark Stadium and was set to conclude Nov. 20 in London at Wembley's SSE Arena.

Tickets will be refunded at original point of purchase.

The canceled dates:
10/1 - Ottawa, ON @ Canadian Tire Centre
10/2 - Montreal, QC @ Bell Centre
10/4 - London, ON @ Budweiser Gardens
10/7 - Winnipeg, MB @ MTS Centre
10/10 - Saskatoon, SK @ SaskTel Centre
10/12 - Calgary, AB @ Scotiabank Saddledome
10/14 - Edmonton, AB @ Rexall Place
10/15 - Dawson Creek, BC @ Encana Events Centre
10/17 - Vancouver, BC @ Rogers Arena
11/10 - Dublin, Ireland @ 3Arena
11/12 - Glasgow, United Kingdom @ The SSE Hydro
11/14 - Birmingham, United Kingdom @ Genting Arena
11/16 - Leeds, United Kingdom @ First Direct Arena
11/18 - Manchester, United Kingdom @ Manchester Arena
11/20 - London, United Kingdom @ The SSE Arena, Wembley