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And this being 1D, it wasn’t long before they were spotted by a car full of fans, in between the boys belting out some of their biggest hits like ‘What Makes You Beautiful’, ‘Story of My Life’ and ‘Drag Me Down’, with their unofficial fifth member (sorry Zayn).
Other highlights include Liam declaring that his ‘arse is on fire’ (don't ask), Harry obsessively fiddling about with his hair and the boys debuting their first ever choreographed dance routine (complete with matching outfits, natch).
The band are the latest in an already long line of huge stars who have joined James on his journey to work.
Mariah Carey, Jennifer Hudson and Rod Stewart have all taken part - and Justin Bieber loved it so much he did it twice.
Watch James and 1D in action in the video above.