Lady Gaga says a “psychotic break” upended the latter shows of her “Joanne” world tour in 2018.

The multi-hyphenate, 39, detailed recent years of mental health struggles in a Rolling Stone cover interview published Thursday.

“I did ‘A Star Is Born’ on lithium,” said the native New Yorker — real name Stefani Germanotta — who immediately after filming the Best Picture contender, for which she won an Oscar for Best Original Song, pivoted to touring.

“There was one day that my sister said to me, ‘I don’t see my sister anymore,'” said the “Disease” crooner, who promptly nixed the last 10 shows of the “Joanne” world tour.

Upon axing the last 10 European shows in 2018, Gaga blamed her struggles with fibromyalgia , but now says she sought mental health treatment at the time.

“There was o

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