A London couple’s wedding at St Paul’s Cathedral was made extra special on Saturday, when their big day was gatecrashed by 'Friends' star Matt LeBlanc. The actor was filming scenes for the new series of 'Top Gear' with rally driver Ken Block, with the duo touring around the capital in a Ford Mustang.

Matt LeBlancMatt LeBlanc filming 'Top Gear'.

The pair drove past the famous landmark just as the newlyweds appeared on the steps. Paul Bradbury, who witnessed the scene outside St Paul’s told the BBC: "It was very very loud and entertaining but everyone seemed to enjoy it.”

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"Matt LeBlanc walked down and had a quick look of the route before he jumped in the car. The car seemed to stall for a couple of minutes but they got going again and made a couple of takes with the wedding party on the steps.”

They then drove to London Bridge, where LeBlanc was seen using his selfie stick to snap a pic. The US star is still getting used to the capital’s unfamiliar streets and has been pictured behind the wheel with a roadmap.

The new series is set to begin on the BBC in May, with Chris Evans hosting. Along with Evans and LeBlanc, the new team also includes Rory Reid, Sabine Schmitz, Chris Harris and Eddie Jordan.

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On Saturday LeBlanc also checked out Canary Wharf and later tweeted a selfie captioned ‘Canary wharf is nice’. Last week the actor shot scenes for the new series in South Africa, where he was joined behind the wheel by rapper Tinie Tempah.