Louis Smith has announced his retirement from gymnastics at the age of 29.
Smith was Great Britain's first individual Olympic medallist for a century when he won bronze on the pommel horse at the 2008 Games in Beijing.
He won a team silver in the pommel at London 2012 and secured another silver in Rio four years later.
Smith wrote on Facebook: "Gym has given me everything - it gave me the tools necessary to channel my ADHD throughout my childhood , and as I grew up through the sport, I very quickly found a purpose in life, and it has made me the person I am today.
"From a young age it became my dream to compete at an Olympic Games and represent Great Britain, so to have had the opportunity to do that on three separate occasions, and bring home four Olympic medals in the process, is something I will forever cherish and for which I am eternally grateful.
"I'm so proud of what I've achieved in the sport and hope that my achievements have left a legacy that will continue to inspire gymnasts of the future."
Smith had been working towards qualification for the Tokyo Olympics in 2020, but now says he will pursue "other exciting opportunities that I've been presented with".
Louis Smith has been suspended for two months by British Gymnastics over a video which appears to show him mocking Islam.Read the full story ›
Olympic silver medalist Louis Smith has apologised after a video leaked online suggested he was mocking Islam.Read the full story ›
Louis Smith will represent Great Britain for the first time since his double Olympic medal-winning performance at London 2012 after being named in the squad for the European Championships.
Smith, who won pommel horse silver and team bronze at the London Games before pursuing a media career, competed for England at last year's Commonwealth Games and has been selected after winning gold on the pommels at the recent British Championships.
Some of the people honoured as Orders of British Empire, including gymnast Louis Smith and choreographer Arlene Phillips, have updated their Twitter profiles with their new titles.
Gymnast Louis Smith has said that getting an MBE is a "massive pat on the back".
He told ITV News' Correspondent Nina Nannar that he plans to spend more time getting kids involved in gymnastics, but would not reveal whether he plans to compete in the 2016 Olympic Games in Rio.
Louis Smith has tweeted this photo of himself "chilling" with his MBE:
Olympic gymnast Louis Smith has tweeted about being awarded with an MBE this afternoon.
The Olympic gymnast Louis Smith has received his Member of the British Empire (MBE) medal in an investiture ceremony at Buckingham Palace.
Olympic medallist-turned-Strictly Come Dancing champion Louis Smith described his MBE as "without a doubt the proudest moment of my life".
The Peterborough gymnast was a member of Britain's surprise bronze medal success in the men's team competition at the London 2012 Olympics.
He also won silver on the pommel horse with one of the hardest routines in the world.
"To receive this honour is out of this world and something I never would have dreamt of as I grew up in the sport of gymnastics," said Smith, 23.