Stefani Germanotta had to leave behindLady Gagain order to get into character asHarley Quinn.

People know me by my stage name, Lady Gaga, right?

Thats me as that performer, but that is not what this movie is; Im playing a character.

Lady Gaga as Harley Quinn stares into the camera with her makeup smeared in a still from ‘Joker: Folie à Deux’

Lady Gaga as Harley Quinn in ‘Joker: Folie à Deux’.Todd Phillips Instagram

Im a trained singer, right?

So even my breathing was different when I sang as Lee.

It was unlike anything Ive ever done before, she said.

‘Joker: Folie à Deux’ teaser

Lady Gaga as Harley Quinn & Joaquin Phoenix as Arthur Fleck inJoker: Folie à Deux.Todd Phillips Instagram

Phillips also raved about Gagas performance.

She became the way how [Charles] Manson had girls that idolised him, added Phillips.

The way that sometimes these [imprisoned murderers] have people that look up to them.