Richard Hammond attends the UK Premiere of "Sicario" at Empire Leicester Square on September 21, 2015 in London, England. Picture: Anthony Harvey/Getty Images.

The Grand Tour host, 47, was driving a supercar worth £2 million for the Amazon show when he lost control before it flipped and then burst into flames, The Sun reports.

The star, who nearly died in a car crash in 2006, is now being treated in hospital with serious injuries — believed to include a fractured knee.

He was attending a car race in St Gallen, Switzerland, when he suffered the crash.

Hammond, who presents the big budget show with Jeremy Clarkson and James May, was then taken to hospital by the local air ambulance where is now being treated.

And 11 years ago Hammond, affectionately nicknamed Hamster, almost died in a 288mph collision on BBC2 show Top Gear.

It is thought he was driving a Rimac supercar at the time, an electronic vehicle which can reach speeds of nearly 200mph.

A source said: “Richard is conscious but very shaken.

“He is currently being treated in hospital for a fractured knee and having the once over. It’s quite incredible he’s come away from this with nothing more serious quite frankly.

“The crash was really bad. The car completely flipped and then burst into flames.

“There was real concern for Richard but the emergency services were quickly on hand and he’s a very lucky boy.

“It brought back horrendous memories of the 2006 crash for those who witnessed it.”

It comes just three months after The Sun revealed how he was left unconscious after falling off a motorbike while filming the car show.

He lay unconscious in the road in remote Mozambique, miles from medical help.

The father of two was in a coma for two weeks in 2006 after the jet-powered car he was piloting for Top Gear crashed.

Its right tyre blew as he tried to set a land speed record at RAF Elvington near York.

He was airlifted to hospital in Leeds.

Hammond later revealed he suffered depression, paranoia and memory loss due to brain damage.