Stars have been tweeting their congratulations after Bruce Jenner's female identity was revealed.
The former Olympic athlete announced last month she was planning to live life as a woman.
She's revealed her new name and look on the cover of Vanity Fair - alongside the headline 'Call me Caitlyn' - breaking a Twitter record by becoming the fastest person to reach one million followers.
The 65 year-old has spoken movingly to the magazine about going through a gender transition in public.
Broden Giambrone is Chief Executive of Transgender Equality Network Ireland.
He says Caitlyn's very public coming out will really help people who may be struggling with their identity:
