The pair were photographed moments after Mr Corbyn's car ran over the foot of a BBC cameraman as the Labour leader arrived for a meeting with senior party figures in central London this morning.
It capped off a woeful 14-hour horror show, which began at around 9pm last night when Mr Corbyn's left-wing manifesto was embarrassingly leaked a week early.
As the party went into meltdown this morning over the unprecedented campaign breach, Mr Corbyn compounded the chaos by pulling out of a poster launch - leaving young activists bewildered.
But few would have expected the latest turn of events, which has seen Twitter erupt with questions about what the Labour leader was doing with a Tom Cruise lookalike.
One user wrote: 'Tom Cruise filming the next Mission: Impossible in Corbyn's car, the mission get Labour into government'.
Another, Alan Kennedy, posted: 'That awkward moment when you get run over by Corbyn's car and Tom Cruise steals the story.'
Ged Hurst tweeted: 'Jeremy Corbyn's day of chaos: no wonder he's got Tom Cruise in the car with him', while Jon Long added: 'Lots of talk about Corbyn's car running over a cameraman's foot, I'm more interested in what his meeting with Tom Cruise was about.'
Despite the excitement, the man in the photograph was not Mr Cruise - nor does he actually look that similar to the Hollywood actor.
It is believed to be Momentum activist James Schneider, who is now the head of strategic communications in the Labour leader's office.
The 29-year-old, who was privately educated and grew up in a house now worth £7million in Primrose Hill, one of London’s most exclusive neighbourhoods, has been in the role for just over six months.
He describes himself as having been an 'African-focused' journalist for five years, including posts as editor of an online news analysis website on Africa and a spell on a magazine.
But he first hit the headlines himself as a founder of the pro-Corbyn grassroots movement Momentum. The organisation was set up in October 2015, four weeks after Mr Corbyn was elected leader.
Mr Schneider was a national organiser and press officer for Momentum.
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