Ms Nakayama had originally been scheduled to perform a Christmas show in Osaka on Friday, but cancelled her appearance, citing poor health.

A statement on her website, published by her agency, confirmed her death on Friday.

“We are stunned by the sudden occurrence of this event,” the statement said, adding that her cause of death was not confirmed.

Ms Nakayama, who was one of Japan’s most popular teen idols in the 1980s, also enjoyed an illustrious acting career – most notably as the lead actor in Love Letter, a 1995 film about a grieving widow’s letters with a stranger.

The film became a massive box office hit and garnered critical acclaim both domestically and internationally. Ms Nakayama’s performance earned her several best actress awards.

Ms Nakayama leaves behind a son, who is in the custody of her ex-husband, musician Hitonari Tsuji.