Tom Daley has announced his engagement to partner and film director Dustin Lance Black in the Times.
The British Olympic diver, from Plymouth, listed it in the newspaper's Births, Marriages and Deaths section.
Tom Daley, 21, revealed he had a boyfriend in 2013 in a YouTube video but didn't reveal who it was.
In June, he told Newsbeat that he found saying he had a boyfriend "weird", but said that coming out as gay made him feel "more comfortable" straight away.
Dustin Lance Black, 41, is a US film director, writer and producer.
He won the best original screenplay Oscar for the 2008 film Milk, which was based on the life of gay rights activist and politician Harvey Milk.
Black grew up in a Mormon home in Texas and has spoken about his fears that he was "going to hell" when he first developed feelings for a boy as a child.
In his Oscar speech he told how the story of Harvey Milk gave him "hope to live my life" and urged greater acceptance of gay and lesbian people.
"It gave me the hope that one day I could live my life openly as who I am and maybe even I could fall in love and one day get married," he said.
"I want to thank my mum, who has always loved me for who I am even when there was pressure not to."
He and Tom Daley moved in together last May in London.
In his 2013 YouTube video Tom said his "whole world changed" when he fell in love with a man.
"Come spring this year my life changed massively when I met someone and they make me feel so happy, so safe, and everything just feels great and, well, that someone is a guy.
"And it did take me by surprise a little bit. It was always in the back of my head that something like that could happen, but it wasn't until spring this year that something just clicked, it felt right.
"Of course I still fancy girls but right now I'm dating a guy and I couldn't be happier. It makes me feel safe and it just really does feel right."
In his interview with Newsbeat, Tom admitted that he still "thinks twice" when he talks about being gay.
"As the months have gone on I've felt more and more comfortable saying it and give me another year and I'll probably feel at my most comfortable but it's still weird."
Tom Daley is now an ambassador for the charity Switchboard, which aims to provide support for the LGBT+ community.
"I'm still constantly learning about the LGBT+ community and I'm just being who I am. All I can do [is] encourage other people to embrace who they are and be proud of it," he says.
"I was lucky enough before I came out to have friends and family that were so supportive and I could speak to, but lots of people aren't so lucky to have that support system around them."
Tom started diving aged seven and is a member of Plymouth Diving Club.
He won a bronze medal at the London Olympics in 2012 for the 10m platform and has won two World Championship golds.
He's now preparing for the Rio de Janeiro Games next year.
Tom told us that he'd prefer a gold medal to true love in his Sex or Chocolate interview (above).
He told Newsbeat that he hasn't encountered any discrimination in sport because of his sexuality.
"I don't think there should be any reason for there to be any discrimination or homophobia or anything like that in sport because sport is the one place where you're judged on performance and nothing else."