Speaking during a US TV interview with Diane Sawyer, Bruce shared his news, discussing how long he's identified as a woman and revealing which Kardashian family members have offered advice.
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A number of celebrities took to Twitter before Jenner's two-hour interview was even over, praising the star for his courage and inspiring story.
We have the chance to write this moment in history together. Let's empower people like Bruce all over the world by being loving & not mean.
— Lady Gaga (@ladygaga) April 24, 2015
I am so unbelievably out here for Bruce Jenner. For Her. ✊
— Scout LaRue Willis (@Scout_Willis) April 25, 2015
I was proud of Bruce Jenner in Montreal and I'm proud of him tonight. Some have to fight more than the rest of us for their happiness.
— Rob Lowe (@RobLowe) April 25, 2015
We are witnessing history. This is beautiful to watch. #BruceJennerABC
— Russell Simmons (@UncleRUSH) April 25, 2015
One small step for man, one giant leap for mankind. #BruceJenner #Brave
— jimmy fallon (@jimmyfallon) April 25, 2015
Bruce Jenner is a beautiful, brave human being. Sending him lots of love. He's saving lives and opening minds tonight.
— Ellen DeGeneres (@TheEllenShow) April 25, 2015
#BruceJenner we learn from you to be courageous, funny and to be our authentic self. With love and Go For It!
— Billie Jean King (@BillieJeanKing) April 25, 2015
The 65-year-old told Diane: "For all intents and purposes, I am a woman,” Jenner told Diane. “My heart and my soul and all I do in life, that is part of me.
"I'm me. I'm a person. This is who I am. I'm not stuck in anybody's body. My brain is much more female than male. For all intents and purposes, I am a woman. People look at me differently."

A number of Bruce's friends' views were also shared during the show, and Diane shared that his decathlon teammates had reached out to share their support, stating: "He'll always be a friend."
Since 2007, Jenner and Kris have starred in their E! reality TV show ‘Keeping Up With The Kardashians’, with Jenner's children from a previous marriage Brandon and Brody, Kris's kids Kourtney, Kim, Khloe and Rob, and thier children together, Kendall and Kylie.
Bruce discussed his family's response to the news on the show, admitting that Khloe has struggled to deal with it.
He also revealed that he decided to tell Kim about his situation when she caught him cross-dressing, adding that at one point, when she was having difficulties understanding things, Kanye West offered some breakthrough advice.
Bruce explained: "They were talking about it. He said to Kim, 'I can be married to the most beautiful woman in the world, I am, I could have the most beautiful daughter in the world and I do, but I'm nothing if I can't be me, if I can't be true to myself.'
"From Kanye, yes, since then Kimberley has been by far the most accepting."
After 22 years of marriage, Jenner and Kris began living apart in 2013, and their divorce was finalised in March 2015.
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