The couple had revealed they were expecting a baby through a surrogate in the United States in February.
They announced the news in a brief announcement printed in the Times newspaper on Saturday.
BLACK-DALEY On 27th June 2018 to Thomas Robert Daley and Dustin Lance Black, a son, Robert Ray, the announcement read.
Earlier this year, Daley said he wanted to be as good a dad as his father, who was also called Robert and died in 2011.
He also spoke of how the impending fatherhood changed his perspective as he competed at the Commonwealth Games on the Gold Coast in April.
He said It’s been such a crazy experience. It changes your outlook on life.
Even on a plane. I’m never scared of flying – and as soon as there was any turbulence I was like ‘oh my God’, because there’s more than my life I have to care about now.
It made me feel a bit more nervous. It changes your perspective on absolutely everything.
It’s all filled with excitement, getting everything ready, feeling like you don’t really know what’s going to happen.
The fear of what might happen and the excitement. There’s so many emotions that come with being an expectant father.
Daley met Black, an American, in 2013 and came out later that year.
They became engaged in October 2015 and were married last May.
Black won an Oscar for best original screenplay for Milk, a film based on the life of gay rights activist and politician Harvey Milk.
News Source SkyNews