Viewers were left confused after Monday night's Britain's Got Talent after they spotted that judge David Walliams was given a different chair to his co-judges Simon Cowell, Alesha Dixon and Amanda Holden.
Taking to Twitter, one person said: "#bgt has anyone else noticed that David is sitting in a different chair to the rest of the judges? Why is that."
While a different account added: "I noticed that too! I'm not sure why he's sitting in a different chair, but I'm curious to find out!"
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However, 50-year-old David himself has revealed the reason why he was given a different chair to his co-judges, revealing that it is to do with a past back operation.
Tweeting back in 2018, the star wrote: "For those of you who want to know why I have different chair to the other judges on @BGT it is because I had a back operation to remove a disc after my Thames swim for @sportrelief and so need to sit on chairs that are specially designed for people with back problems."
David took part in Sport Relief in 2011, where he swam the length of the River Thames, which is around 140 miles.
Two years later, in 2013, the judge was forced to cancel work commitments as he underwent "long overdue" back surgery.
Issuing a statement at the time, David said: "Unfortunately, the operation on my back is long overdue and can't wait a moment longer.
"After Tuesday, the doctors have ordered me to rest for the remainder of the year, so I can recover."
It comes after Britain's Got Talent viewers defended David after pressing his buzzer during Tuesday's second semi-final show.
The comedian was left unimpressed by Ranger Chris' performance and pressed his buzzer, with the studio audience then beginning to boo him.
Chris performed a mixture of songs alongside a group of dancing dinosaurs, and while fellow judge Amanda Holden happily danced along and cheered them on, David wasn't so enthusiastic about the performance.
He exclaimed: "I'm not quite sure what the talent is! You've got some friends who like dressing up as dinosaurs," and the crowd instantly started to shout and boo behind him.
He jokingly shouted back at them: "Boo you!" as they continued.
However, many viewers appeared to agree with David, and defended him pressing his buzzer on social media.
One person said: "I'm not quite sure what the talent is?! I quite agree David!!," as another agreed, saying: "David is right there is no talent".
While a third viewer wrote: "David reminding us a buzzer does exist is actually comforting".
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