The Voice judge Will.i.am carried the Olympic Torch today.
The Black Eyed Peas star was cheered on by thousands of people as he ran through Taunton carrying the flame.
The United States-born music producer was a surprise addition to the line-up on day three of the relay.
Will.i.am, 37, looked at ease in the warm weather as he jogged through the Somerset town centre.
The Metropolitan Police Torch Security Team, which runs alongside the torchbearer, kept a watchful eye on the cheering crowd.
The music producer's torch was "kissed" by that held by 26-year-old taekwondo instructor Chloe Lock, from Honiton, Devon, to light the flame.
Before he started running he was passed his mobile phone and was tweeting as he set off down the road under Union Flag bunting and surrounded by screaming fans.
He held his phone in the air indicating to people to follow him on the social networking site.
After a couple minutes he waved to the crowd while smiling broadly.
He also turned around to perform a short moonwalk to the delight of onlookers.
Thousands turned out to watch the torch travel through the town unaware of the surprise appearance.
They waved colourful flags and children held homemade torches made from bright yellow and red paper.
Will.i.am's turn in the relay was over in under five minutes when he passed the flame to the next runner, biathlete Emma Fowler.
Speaking after his run, the music star said: "That was like a surreal moment.
"I remember in 1984 the Olympics in Los Angeles, me being a little Will watching it on TV wishing I could be at the Olympic Games.
"I had that flashback when they handed me the torch to run in Taunton.
"It's like a blast moment and a surreal moment and a can't believe it moment all at the same time.
"I got a little more nervous this time than all the things I have done.
"I am not holding a flame when I am performing in front of people and the last thing you want to do is make a mistake with fire in your hands."
Will.i.am said: "I'm a huge Olympics fan. I want to see the swimming match, I want to see Usain Bolt.
"I want to see if he's really that fast because I want to race him one day. I wouldn't win but I want to see how close I would come."
The star said he was amazed at the number of people who had turned the relay through Taunton into a real family occasion.
"I just saw everyone coming out, excited that the running of the torch was here in their neighbourhood, in their city and pride for the city," he said.
"To see families and little kids and their parents and everyone just having a good time - I am so glad I came here. It's great people, great energy, a great vibe.
"There's one area, it's like a village of houses and it looked like the neighbourhood I came from in Boyle Heights, where the neighbours looked after the neighbours, and it looked like a real community and that reminded me of the community I come from."
He confessed he had never been to a cricket ground before and added: "But I reckon I would be pretty good."
There were no mishaps for Will.i.am, real name William Adams, unlike earlier when the torch went out for the first time during the 2012 relay and had to be relit.
The torch was attached to the side of Paralympic badminton star David Follett's wheelchair in Great Torrington, Devon, when the flame went out shortly before 10am.
A spokeswoman for the London Organising Committee of the Olympic and Paralympic Games (LOCOG) said: "The flame went out due to a malfunctioning burner. It is not uncommon for a flame to go out and this can happen for a number of reasons, for example, in extreme winds."
A replacement torch was brought out from the convoy of vehicles and was lit from the mother flame.
"We keep the mother flame in specially designed miners' lanterns so if the flame does go out for some reason on the relay we relight it from the source of the flame," the spokeswoman added.
Follett was paralysed at 19 when he was struck by a car. After returning to college to complete his A-levels he looked at what sports were available to wheelchair athletes and helped to set up a badminton club.
With his playing partner, Follett has been unbeaten for three years in the four nations competitions and he is now the world number one in his class.
During the third day of the relay dozens of unsung and hard-working individuals got their moment in the spotlight as they carried the torch from Exeter to Taunton.
They carried the Olympic Flame alongside some of Britain's top sport stars, including Ashes-winning cricketer Marcus Trescothick and Olympic gold medal-winning triple jumper Jonathan Edwards.
Some of the torchbearers have started to cash in on their once-in-a-lifetime privilege by selling their torches on eBay.
Before the first day of the relay was completed, the gold torches appeared on the online auction site.
A torch used during the relay on Saturday is currently attracting bids of more than £30,000.
The seller lists the item as: "An amazing sporting souvenir, be one of the first to have one."
Other torchbearers have pledged to donate the proceeds from the sale to charity.
Sarah Milner Simonds, from Burnham-on-Sea, who is selling her torch to raise money for the project she represents, said she had received a bid of more than £150,000.
Ms Milner said she needed to check if the bid was genuine, telling BBC Breakfast: "It only occurred to me to do it on Saturday night.
"The sale closed last night at 10 o'clock and the final bid was £153,000."