The 'You're Beautiful' hitmaker saw the late 'Star Wars: The Force Awakens' actress - who passed away in December after suffering from a heart attack - as his ''American mother and a real inspiration'' and revealed how she seemingly predicted the date of her own death.
She said: ''Fisher was my American mother, and a real inspiration. My first album was called 'Back to Bedlam' because I lived in a madhouse with her.
''She put a cardboard cutout of herself as Leia outside my room, with her date of birth and date of death on her forehead. I'm trying to remember what the date was, because it was around now - and I remember thinking it was too soon. She went out with a bang, as she was back in movies. Maybe it was a great time to go.''
And the 42-year-old singer is upset his son never got a chance to meet his godmother Carrie.
He added to The Sunday Times' Culture magazine: ''The saddest thing is that my son will never get to know someone I thought was the most special person.''
Carrie passed away on December 27, just days after she had become unconscious on a flight from London to Los Angeles.
And just a day after her untimely death, her mother Debbie Reynolds tragically died after suffering an intracerebral haemorrhage, which was caused by a ruptured blood vessel that led to bleeding in her brain.
The pair have been remembered by some of the world's biggest stars and Hollywood took time to pay tribute to the mother and daughter duo at the Golden Globes last month.
Carrie's half sister Joely Fisher - who attended the ceremony - said at the time: ''I think about their unparalleled and incomparable careers [when I see tributes like this]. The Globes are honouring best of performances of the year, and the best in life. I'm proud, and sad, and feeling the same sort of chasm on the planet that everybody else is. I decided to make it out of my house today to [honour] my girls. I'm gonna go celebrate the ladies. I think we're all super-proud.''
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Sometimes actors are not acting.