Lady Gaga had a tremendous 2017. At least that’s the way it seemed to the outside world.

The “Bad Romance” hitmaker starred in the Super Bowl LI Halftime show in February, which attracted 117.5 million viewers in the United States. She also headlined the Coachella Valley Music and Arts Festival, launched her Joanne World Tour and released her Netflix documentary, “Gaga: Five Two,” which was supposed to be a behind-the-scenes look at her Super Bowl performance and Joanne tour.

Actually, behind-the-scenes, Gaga had begun production on “A Star is Born,” just as her mental health was unraveling, as she revealed in a new cover story with Rolling Stone.

“I did ‘A Star Is Born’ on lithium,” the pop mega-star revealed, “offhandedly,” Rolling Stone said. Right after shooting “A Star is Born,” sh

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