The 35-year-old chart-topping singer has admitted that she's had some 'dark moods' during the past few months and that Pirates of the Caribbean star Orlando is the "only one" who could have handled her during this time.
Katy is expecting her first child with British actor Orlando and told a US radio station the baby is due "soon" and she is "not anxious at all about it".
She also discussed a period of depression after feeling a sense of failure following her 2017 album Witness and claimed Orlando was her "perfect" partner when she was at her lowest.
Speaking on Howard Stern's SiriusXFM show, Katy said: "I showed him all of it and he still shows up and he's not fazed by it. That's why he's perfect, because I'm a lot."
Katy also opened up on the mental health treatment she and Orlando have had.
She continued: "I actually went to this place called the Hoffman Process, which Orlando went to as well, which is a week-long intensive re-wiring of your neural pathways through psychological and spiritual exercises."
Katy continued: "It's mostly science but it could come off a little hippy-dippy for some people.
"Basically, you just re-wire the negative paths, all the negative habits that you had for so many years, and you don't understand why you keep going through that loop."
Katy has also taken time to show off her burgeoning baby bump as part of a launch of new merchandise to promote her new album, Smile.
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