Canadian singer-songwriter Shawn Mendes has apologised to Sam Smith after using the wrong pronoun to address the pop star.
Smith, 28, identifies as non-binary and uses "they, them and theirs". While introducing Smith at iHeartRadio's Jingle Ball, Mendes, 22, referred to the singer as "he".
Mendes, whose hits include Stitches and Wonder, apologised on Instagram.
He said: "I'm so sorry for referring to you as a 'he' for your Jingle Ball introduction.
"It absolutely slipped my mind. Wont happen again...Sending you so much love! Also you are absolutely one of the funniest people I've ever met!"
Smith, an Oscar, Grammy and Brit award winner, accepted the apology, saying: "We're all learning together. Happy holidays, all my love xx."
Sam Smith concert at Palacio de los deportes Mexico City, July 27 2018 (Photos by Liliana Ampudia Mendez/Sipa USA)
File photo dated 28/02/16 of Sam Smith (right) and Jimmy Napes with the Academy Awards for Best Original Song following the 88th Academy Awards. Smith has said he is finally trying to "embrace" his Oscar after years of hiding it away.
Sam Smith sighting with Fans in Mexico City, Mexico on July 26, 2018. (Photos by Liliana Ampudia Mendez/Sipa USA)
EDITORIAL USE ONLY Sam Smith performs in concert at Madison Square Garden in New York.
Sam Smith performs during the first day of BBC Radio 1's Biggest Weekend at Singleton Park, Swansea.
Singer Sam Smith and event honoree Julie Andrews attend the 'Raise Your Voice' concert honoring Julie Andrews at Alice Tully Hall, Lincoln Center on March 5, 2018 in New York, NY. (Photo by Joe Russo / Sipa USA)
EDITORIAL USE ONLY.
Sam Smith performs on stage at the Brit Awards at the O2 Arena, London.
Winnie Harlow and Sam Smith on stage at the Brit Awards 2019 at the O2 Arena, London. PRESS ASSOCIATION PHOTO. Picture date: Wednesday February 20, 2019. See PA story SHOWBIZ Brits. Photo credit should read: Victoria Jones/PA Wire. EDITORIAL USE ONLY.
Sam Smith attending the Brit Awards at the O2 Arena, London. Photo credit should read: Doug Peters/EMPICS Entertainment
NEW YORK - JANUARY 28: Sam Smith at the 60th Annual Grammy Awards at Madison Square Garden on January 28, 2018 in New York City. (Photo by Scott Kirkland/PictureGroup)
(left to right) Mark Hamill, Daisy Ridley, John Boyega, Graham Norton, Gwendoline Christie and Sam Smith during filming of the Graham Norton Show at The London Studios, to be aired on BBC One on Friday.
Sam Smith is interviewed backstage by presenter Roman Kemp during day one of Capital's Jingle Bell Ball 2017 at the O2 Arena, London.
Laverne Cox pictured with presenter Sam Smith backstage at the Attitude Awards, where she won won the Inspiration award, at the Roundhouse in North London. Picture date: Thursday October 12th, 2017. Photo credit should read: Matt Crossick/ EMPICS Entertainment.
Sam Smith outside BBC Broadcasting House in London, where he appeared on on The Radio 1 Breakfast Show with Nick Grimshaw.
Sam Smith (right) greets the Duchess of Cornwall during a reception for British Academy Awards winners at St James's Palace in London.
Jimmy Napes and Sam Smith in the Press Room at the 88th Academy Awards Ceremony held at the Dolby Theatre in Hollywood, California on Sunday, February 28, 2016 (Photo By Sthanlee B. Mirador)
Feb 28, 2016; Hollywood, CA, USA; Sam Smith (right) and Jimmy Napes accept the Oscar for Best Original Song for �Writing�s On The Wall� from �Spectre� during the 88th annual Academy Awards at the Dolby Theatre. Mandatory Credit: Robert Deutsch-USA TODAY NETWORK
Sam Smith attending the Spectre after party held at the British Museum in London
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Smith asked fans to refer to them using the pronouns they/them in September last year.
They said they had earlier questioned their gender and had at one time considered a sex change.
Smith wrote: "Today is a good day so here goes. I've decided I am changing my pronouns to THEY/THEM after a lifetime of being at war with my gender I've decided to embrace myself for who I am, inside and out."