Rest in peace, Mary Lee South.

Tom Cruise is sadly mourning the loss of his beloved mom after she died peacefully in her sleep last week, according to People. Mary Lee was 80-years-old at the time of her passing.

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The 54-year-old actor’s mother — who was reportedly in poor health for the last several years — was honored with a memorial service at her local Church of Scientology this past weekend.

tom cruise mom getty images

Tom and Mary Lee in January 2010.

Tom and his three sisters — Lee Ann DeVette, 57, Cass Mapother, 55, and Marian Henry, 52 — all allegedly attended the memorial service for Mary Lee alongside family and friends.

The mom-of-four — who previously loved attending red carpet events with her famous son — was last seen in public in May 2016 in Clearwater, FL. Prior to that outing, she hadn’t been photographed since 2010.

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Mary Lee was working as a special education teacher when she married Tom’s late father, Thomas Cruise Mapother III. Thomas, who worked as an electrical engineer, and Mary Lee divorced in 1974. Her ex-husband later passed away at age 50 in January 1984.

In 1978, Mary Lee tied the knot with Jack South. Tom was just 16-years-old at the time of his mother’s remarriage. “He loved my mother so much that he took us all in, all four young people,” Tom once said of his stepfather.

tom cruise mom getty images

Tom and Mary Lee in January 2009.

Mary Lee previously opened up about her only son’s rise to fame in an interview with Rolling Stone. After encouraging Tom to try out for his high school production of Guys and Dolls, the teenager went to his parents and asked if he could spend the next 10 years trying to make it as a Hollywood actor.

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“We both wholeheartedly agreed. Because we both felt it was a God-given talent… So to make a long story short, we gave him our blessing — and the rest is history,” Mary Lee said.

Our thoughts are with Tom and his family during this difficult time.