(CNN) - Olivia Newton-John is battling breast cancer for a second time.
The star best known for her role as Sandy in the film Grease was set to hit the road in June for a U.S. and Canada tour, but a statement posted on her official Facebook page says the tour has been postponed.
Newton-John had previously been diagnosed with breast cancer in 1992.
She was declared cancer free after receiving chemotherapy and a partial mastectomy.
Since her own battle, she has been an advocate for breast cancer awareness.
The statement also said she is confident she will be back later in the year.
Rescheduled concert dates are expected to be released in the coming weeks.
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