TV and radio personality Chris Evans will replace Jeremy Clarkson as the lead presenter of an all-new Top Gear line-up, the BBC has announced.
Evans said he was "thrilled" to get the job, describing the motoring show as his "favourite programme of all time".
"I promise I will do everything I possibly can to respect what has gone on before and take the show forward," he added.
Clarkson was dropped in March after punching a producer while on location.
Car enthusiast Evans, who has signed a three-year deal with the BBC Two show, had been tipped to replace his good friend Clarkson but had previously insisted he was not interested.
An "all-new" line-up means Clarkson's co-hosts Richard Hammond and James May will not be involved.
Analysis: David Sillito, BBC media and arts correspondent
When Jeremy Clarkson relaunched Top Gear in 2002 it ceased to be a programme about cars; it became a programme about slightly tragic men who loved cars.
The essence was banter, lists and brilliant film-making. The problem is what happens when you lose the blokes.
Chris Evans is one of Britain's most successful broadcasters. He loves cars, he understands how to make television and he's a friend of Jeremy Clarkson. But he ain't Jeremy Clarkson.
Around the World Top Gear has appeared in different forms. The ones that work best have Jeremy Clarkson - even if he has to be dubbed into Farsi.
Top Gear is watched by 350 million viewers worldwide and is one of the BBC's biggest shows, with overseas sales worth an estimated £50m a year.
Once the news broke, Evans tweeted: "First tweet as new Top Gear host. I would like to say Jeremy, Richard & James are the greatest. And NO I'm not leaving the R2 Breakfast Show."
And in a statement, he said: "I'm thrilled, Top Gear is my favourite programme of all time.
"Created by a host of brilliant minds who love cars and understand how to make the massively complicated come across as fun, devil-may-care and effortless.
"When in fact of course, it's anything but and that's the genius of Top Gear's global success."
Back in March, Evans had denied that he was taking over the show's presenting duties, tweeting: "I can categorically say I am not and will NEVER be running for office. Pls discount my candidacy."
Controller of BBC Two and BBC Four Kim Shillinglaw said she was "delighted" that Evans would be presenting the next series of Top Gear.
"His knowledge of and passion for cars are well known, and combined with his sheer inventiveness and cheeky unpredictability, he is the perfect choice to take our much-loved show into the future," she said.
"Chris is a huge fan of Top Gear and has great respect for the craft and work ethic of one of the best production teams in the world.
"He knows the phenomenal attention to detail it takes to make a single sequence of Top Gear, let alone a whole series. He is already full of brilliant ideas and I can't wait for him to get started."
Analysis: Mark Savage - BBC News entertainment reporter
There's a very telling line in Chris Evans' statement: "I promise I will do everything I possibly can to respect what has gone on before and take the show forward."
The 49-year-old is acutely aware of Top Gear's reputation - and the reaction his appointment will provoke.
On paper, he's a perfect replacement for his good friend Jeremy Clarkson. A car nut with a motor mouth and a track record in steering a television juggernaut to success.
But he's also a divisive figure, with many viewers put off by the unruly, egotistical behaviour of his tabloid years.
Evans even admitted there was a "50/50 split" among Top Gear fans over whether his involvement was a good idea.
However, he added: "In TV or radio, if you get a 50/50 love/hate reaction that usually equals massive hit."
Only time will tell.
Production on the new series of Top Gear will start in the next few weeks and the BBC said more information would be announced in due course.
Jeremy Clarkson was suspended, then dropped, by the BBC in March following a "fracas" with a producer at a hotel.
His final appearance on Top Gear will be shown on 28 June. The episode will be made up of two films shot before Clarkson was suspended, with Hammond and May presenting links from the studio.
Viewers will see Clarkson, Hammond and May behind the wheel of classic cars and beaten-up 4x4s in their final challenges as a trio.