The 69-year-old singer and his husband David Furnish have two sons, Zachary, six, and four-year-old Elijah - who were born to a surrogate.
John says it is "unimaginable" how much his life is different now to before he became a parent, and he couldn't be happier with the changes, reported Contactmusic.
"It's unimaginable how the children have changed my life. Years ago I couldn't imagine becoming a dad, but the kids have changed me so much as a person and for the better.
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