Anastacia has been forced to cancel her tour after being diagnosed with breast cancer for a second time.
The US singer, whose European tour was due to begin in London in April, survived her 2003 battle with the disease.
But she's announced on Facebook that she is cancelling all performances, tours and any travel until further notice as she focuses on her "one goal... to make a full recovery with the support of her family, friends and everyone around her."
The I'm Outta Love singer told her fans: "I feel so awful to be letting down all my amazing fans who were looking forward to It's A Man's World Tour. It just breaks my heart to disappoint them."
The statement said that Anastacia will continue writing and recording her new album despite her diagnosis and that she hopes to schedule a new tour as soon as possible.
"Now more then ever, she is determined to live by her motto 'Don't ever let cancer get the 'Best of You!'," the statement, referring to the name of her recent song, said.