The 60-year-old’s latest album, Madame X, is released today.
Her 14th album was conceived in Lisbon, Portugal, after she relocated there so her son David could attend a football academy.
She said she had unexpectedly found herself becoming a “soccer mum”.
“I surprised myself,” she said.
“Barcelona and Turin were an option, but I couldn’t see myself living there. It would have been a lot easier if he’d liked music!”
Asked if she watches her son’s games, she said, “I admit I only watch when he’s playing. If he’s on the bench, I’m on my phone.”
Watch the full interview on The Graham Norton Show tonight on BBC One at 10.35pm.