Jeremy Corbyn has been caught out pretending he watches the Queen's message on Christmas Day.
The Labour leader - a long-standing Republican - was humiliatingly picked up on the claim during an ITV interview.
Julie Etchingham: 'Do you sit down to watch the Queen's speech, Mr Corbyn?'
Jeremy Corbyn: 'It's on the morning, usually we have it on some of the time.'
Etchingham: 'It's not on in the morning. It's at three o'clock in the afternoon.'
Corbyn: It's when its repeated... in the afternoon.'
Etchingham: 'So you don't sit down as a family to watch the Queen's speech.'
Corbyn: 'We don't watch television very much on Christmas Day. Maybe a film in the evening. Erm I'd like to do a bit of exercise on Christmas morning.'
Etchingham: 'You do some exercise on Christmas morning. I don't think the Queen's speech is in the morning.
'It's three o'clock in the afternoon. That's when everybody watches it.'
Corbyn: 'Well. Our Christmas is sometimes...'
Etchingham: 'You don't watch it do you, Mr Corbyn.'
Corbyn: 'There is lots .. lots to do .. I enjoy the presence of my family and friends around Christmas. Obviously, like everybody else does.
'And, I also visit the homeless shelter, either on Christmas Day, or the day before, to talk to, and listen to people's lives, about how they could be made better with a government that cared for them.'
In a toe-curling exchange with presenter Julie Etchingham, Mr Corbyn said he watched the traditional broadcast in the morning.
But he was then brutally informed that the monarch's words air at 3pm in the afternoon.
As Mr Corbyn tried to bluster his way through the embarrassment by suggesting the afternoon programme is a repeat, Etchingham said: 'You don't watch it do you, Mr Corbyn?'
The disastrous clash came as Labour desperately tries to improve the veteran left-winger's dire personal ratings by talking about his life.
Mr Corbyn is seen as a serious drag on the party - which is trailing the Tories by nine points in a poll today with a week to go until the election.
In an extraordinary verdict, the New Statesman magazine - known as the Labour bible - has branded the leader 'not fit' to be PM and
After asking what Mr Corbyn does at Christmas, Etchingham said: 'Do you sit down to watch the Queen's speech?'
He replied: 'It's on the morning, usually we have it on some of the time.'
Etchingham persisted: 'So you don't sit down as a family to watch the Queen's speech?'
The Labour leader protested that his family 'doesn't watch television very much on the day'.
He then claimed that he likes 'to do a bit of exercise on Christmas morning', prompting Etchingham to once again point out that the speech first airs in the afternoon.
The interviewer finally asks 'You don't watch it do you, Mr Corbyn?'
Mr Corbyn flannels that there is 'lots to do' on the day, including a visit to a local homeless centre.
During the wide-ranging interview, Mr Corbyn also said that if elected he would let homeless people live in Chequers, the country house of the Prime Minister in Buckinghamshire.
He points to the fact that the UK is home to 150 billionaires, adding: 'We've still got people sleeping on the streets.'
Mr Corbyn's position echoes the sentiments of shadow chancellor John McDonnell, who said he would let a homeless family move into No11 Downing Street.
However, under the terms of the bequest of Chequers to the nation in 1917 it appears Mr Corbyn would not be able to let other people live in it.
Instead, if he opted not to use it as a country residence, the US ambassador would be offered the privilege.
During the interview, Mr