Top Gear brought their high-budget stunts to a new level in London at the weekend - by crashing what appeared at first glance to be a wedding.
But all was not as it seemed in central London, as evidence began mounting up that the nuptials were as fake as the bride's bunch of plastic flowers.
Not only did a St Paul's volunteer spot the pair having a coffee in Starbucks earlier on Saturday morning, she also confirmed there were also no weddings at the cathedral that day.
To get married there, one of the couple has to have an OBE or be related to someone with the title.
And MailOnline can reveal that the groom is thought to be Simon Bond, a BBC Worldwide digital communities manager working on Top Gear - who does not have an OBE.
St Paul's Cathedral volunteer Charlotte Morris, 38, said: 'I saw the bride sitting in Starbucks at about 8am with an anorak over her head and her feet up while drinking a cappuccino.
'Both the bride and the groom were in there having a coffee.
'I've been in the cathedral all day because it's disabled access day. All of the volunteer staff were in today but to the best of my knowledge none of us knew about a wedding being booked.
Self-proclaimed petrol-head LeBlanc roared up to the steps of St Paul's in the mean looking muscle car, with tyres screeching as the blushing 'bride' watched on alongside groups of tourists as rally driver Ken Block did donuts with LeBlanc in the passenger seat.
While the pair looked unsurprisingly accepting of the stunt, motorists were left furious as Tower Bridge was entirely shut earlier in the day for filming, which caused delays across the capital.
They happy couple were pictured simply shrugging their shoulders at the intrusion on their special day, on which everyone knows that the bride, who wasn't wearing a wedding ring, is supposed to be the only focus.
Bond, who is from Bradford, acted the part of the stunned groom as he called someone on his mobile phone on the steps of the cathedral, then wandered down and casually spoke to the presenter, who got out of his car in the shadow of St Paul's.
Onlookers hoping to photograph the bride instead captured the moment the car sped onto the square, with smoke billowing from the back wheels, screeching deafeningly before the crowds.
The mean-looking Ford Mustang was being driven as part of a show that had shut off Tower Bridge earlier this morning, causing chaos for local motorists.
LeBlanc was seen holding a selfie-stick out of the passenger window, which is usually the driver side as the car is an import, taking a picture of himself as Block drove through the streets.
Earlier in the day, the actor produced a huge grin in between takes outside another famous landmark, the Tower of London, as he stood with the crew in a padded North Face coat, a red zip-up jacket and navy jeans.
But motorists will have been less pleased with the road closures, which slowed traffic flow through the city for hours as the Mustang was filmed by a truck with a huge mounted camera which followed behind.
When they eventually arrived at St Paul's, many of the guest looked astonished when the muscle car burst onto the cobbles, carrying LeBlanc in the supposedly unannounced stunt.
Although commentators will be quick to point out that the show is scripted and may find it hard to believe that the bride and groom, who were pictured simply shrugging their shoulders at the intrusion, didn't know he was coming.
Hoonigan Mustang breaks down
The shoot was nearly thrown into jeopardy at one stage after the car broke down, but the dedicated crew managed to get the motor running again to complete the scenes.
Show mechanics were seen attaching jump leads from the 'stunt safety unit' in order to re-start the car, while a double-decker London tour bus waited behind.
Last month, LeBlanc suffered a similar fate while filming on the M1 in a Reliant Rialto alongside co-host Chris Evans.
The victim of engine trouble, the former friends star was forced off the road after his vehicle spluttered to an unexpected stop during filming of the high-budget show, rumoured to cost around $NZ1.5million an episode.
He looked a little more pensive when sat behind the wheel of a mean-looking race car emblazoned with the Monster energy logo.