United Kingdom, June 1 -- Jamie Lee Curtis' sister reportedly died of natural causes.

The actress, 67, revealed on Saturday (30.05.26) her older sibling Kelly Lee Curtis had passed away peacefully at the age of 69, with the star hailing her as her best friend and confidante.

Us Weekly has now reported Kelly died after being in hospice care for the week before her death, with Page Six adding it could "confirm" her death, at 2.30am on Saturday, was from natural causes.

Also according to Us Weekly, she is expected to be cremated.

Like Jamie, Kelly was also an actress, and landed roles in 1987's Magic Sticks, as well as The Devil's Daughter, released in 1991.

At the time of her death, she was married to filmmaker John Marsh.

The report ...