But the flamboyant star, now enjoying life as the parent of a toddler, has admitted it will be ‘heartbreaking’ for Zachary to grow up without a mother.
The singer, 65, and his civil partner David Furnish, were delighted when Zachary arrived on Christmas Day 2010.
Zachary Jackson Levon Furnish-John – to give him his full name – was born via surrogate in California and was conceived using a donor egg.
Sir Elton and Mr Furnish, 49, have made it no secret that they want to have another child, and may start trying to father a sibling for Zachary this summer.
However, in an interview, Sir Elton confessed: ‘It’s going to be heartbreaking for him to grow up and realise he hasn’t got a mummy.