By Daniel J. McLaughlin
Pop star Sam Smith has come out as non-binary and changed their pronouns to "they/them".
The singer said they are "nervous" about announcing it, but hopes fans can see them like they see themselves.
However, Piers Morgan has mocked Smith again about their gender identity.
The singer said they had experienced a "lifetime of being at war with my gender".
In a post on Instagram, Smith said that they have decided to "embrace myself for who I am, inside and out".
They wrote: "I’m so excited and privileged to be surrounded by people that support me in this decision but I’ve been very nervous about announcing this because I care too much about what people think but f--k it!
"I understand there will be many mistakes and mis gendering but all I ask is you please please try. I hope you can see me like I see myself now. Thank you."
Smith said they want to be "visible and open", and will try their best in explaining what this gender identity means.
Piers Morgan responded on Twitter to the singer's decision to change their gender pronouns.
He said: "OK. Is they now entering male or female music award categories?
"And will they be retrospectively changing all the pronouns in their songs, given they sang repeatedly about ‘he’ based on their own life experiences?"
Morgan previously attacked Smith for their gender identity in March. The Good Morning Britain host said: "Sam Smith has announced he's gender fluid - he can't work out if he's male or female.
"I'm now identifying as Sam Smith so I can get his royalties. It works both ways."
When challenged by his co-host Susanna Reid, who asked why Morgan cares, he responded: "He has millions of fans. What are they supposed to think?"
He added: "I think there are so many ramifications around self-identity which actually are a real concern and they haven't really thought it through."
According to LGBT charity Stonewall, non-binary is an "umbrella term" for people whose gender identity does not sit comfortably with man or woman.
They explain: "Non-binary identities are varied and can include people who identify with some aspects of binary identities, while others reject them entirely."
There are many other terms used to describe a non-binary identity. The LGBT Foundation lists a few of those terms: genderqueer, genderf--k, neutrosis, agender, gender fluid, bigender and third gender.
They suggest: "Asking non-binary people how they identify as well as what language they use to describe themselves is almost always best if there is any confusion.
"However, how one non-binary person identifies is not indicative of all non-binary people, and the language one person uses may not be representative or appropriate for another."
Figures from 2014 show that 0.4 per cent of the UK population, which is 1 in 250 people, define themselves as non-binary when given a choice between male, female and another option.
All About Trans say that between 25 per cent and a third of trans people identify in some way outside the gender binary.
The government released their National LGBT Survey in February this year. They found that 13 per cent of respondents were transgender - and of that sample, 6.9 per cent of respondents were non-binary (while 3.5 per cent were trans women and 2.9 per cent were trans men)