Olivia Newton-John is battling her third bout of cancer

Olivia Newton-John has been diagnosed with cancer for a third time, The Hollywood Reporter revealed Monday.

Doctors found a tumor in her lower back last year, Newton-John revealed Sunday on the Australian news show Sunday Night, per The Hollywood Reporter. The four-time Grammy winner was first diagnosed with breast cancer in 1992 and underwent a partial mastectomy. She was re-diagnosed with breast cancer in 2013, which had additionally spread to her shoulder, CNN reports.

Newton-John is optimistic about her current treatment, which involves taking cannabis oil that her husband makes in California, per Entertainment Weekly.

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"My husband's always there, and he's always there to support me. I believe I will win over it, and that's my goal," Newton-John said on Sunday Night.

The Olivia Newton-John Cancer Wellness Research Center is named after her in her native Australia. Newton-John additionally said she hopes the country will legalize medical marijuana. Read more at The Hollywood Reporter.