All white: Oprah Winfrey took some time out from her busy day as she enjoyed a bike ride on Salina, a volcanic island off the coast of Sicily on Saturday

Oprah donned a white jumper for the ride, teaming it with matching trousers and box fresh white trainers.

Ensuring she put her safety first, Oprah wore a black helmet for her excursion on the mountain bike, with her curly raven tresses tied in a ponytail underneath.

Meanwhile, Bradley himself kept things casual as rocked a dark grey T-shirt and bright blue trousers for the sporty activity.

He also added a pair of monochrome trainers, a black sports cap and dark sunglasses.

Easy does it: The chat show host, 65, looked chic in a white outfit as she was given a helping hand from the A Star Is Born actor, 44

Style: Oprah donned a white jumper for the ride, teaming it with matching trousers and box fresh white trainers

Relaxed: Meanwhile, Bradley himself kept things casual as rocked a dark grey T-shirt and bright blue trousers for the sporty activity

The two were later seen loading their bikes onto a boat, seemingly making their way to another location.

Oprah and Bradley were among a large a large group of wealthy and intellectual stars who had flocked to Italy to attend the formerly top secret Google Camp.

Google Camp sees the the world’s most influential people gather in Sicily for an annual three-day event where they debate very important global issues.

This year’s focus was on climate change, however, the stars have faced huge backlash in the wake of their arrival to the event.

Safety: Ensuring she put her safety first, Oprah wore a black helmet for her excursion on the mountain bike, with her curly raven tresses tied in a ponytail underneath

Focus: Oprah’s face was distorted in concentration as she carefully navigated her way around the Italian island

Sporty: Oprah and Bradley were among a large a large group of wealthy and intellectual stars who had flocked to Italy to attend the formerly top secret Google Camp

Day out: Google Camp sees the the world’s most influential people gather in Sicily for an annual three-day event where they debate very important global issues

Celebrities, including the likes of Oprah, Bradley, Harry Styles, Naomi Campbell, have faced ridicule and accusations of hypocrisy for meeting in Italy to save the planet while leaving a huge carbon footprint of their own.

The tech giant spent an estimated $20million on an extravagant climate change bash for a host of A-list celebrities this week, flying hundreds of guests across the world and treating them to three days of luxury at a Sicilian seaside resort.

It’s reported that up to 114 fuel-guzzling private jets were used to get the world’s elite to the destination.

Controversy: Celebrities, including the likes of Oprah, Bradley, Harry Styles, Naomi Campbell, have faced ridicule and accusations of hypocrisy for meeting in Italy to save the planet while leaving a huge carbon footprint of their own

Working up a sweat: Bradley looked in his element as he stood up on the pedals during the energetic bike ride

Cool: The movie star looked contented and relaxed following his high energy bike ride

Go Bradley go:  The Hangover actor was full of concentration as he zipped down a hill

Good friend: Oprah and Bradley enjoyed a fun bike ride around the island of Salina

Prince Harry is reported to have given a passionate, barefoot speech about saving the planet at the event, but Buckingham Palace have refused to confirm his attendance – let alone if he travelled via private jet.

The 300 guests at the secretive camp, who also included Katy Perry and Orlando Bloom, mingled on $400million mega-yachts and cruised around Sicily in $200,000 cars before watching Coldplay’s Chris Martin perform in ancient ruins which cost another $100,000 to rent – even before the show was put on.

Google picked up the tab for their flights, accommodation and entertainment during the three-day ‘Google Camp’, sending the costs spiralling.

Off they go: The two were later seen loading their bikes onto a boat, seemingly making their way to another location

Lost in thought: Oprah appeared somewhat distracted as she joined other friends following her boat ride

Careful now: Bradley lent a hand a pal loaded his bike into the vessel

Day out: The star enjoyed the Italian sunshine as he chatted to a fellow bike rider

BBC presenter Andrew Neil was among those to point out the irony, saying: ‘Scores of celebrities and the rich have arrived in Sicily for a Google conference. They came in 114 private jets and a flotilla of super yachts. The conference is on global warming.’

Sources told Page Six that the total cost of the Google-funded showpiece would run to around $20million.

The combined carbon footprint of dozens of flights from Google’s Los Angeles base to the Verdura resort would also come to around 780 tonnes of C02, although it is not clear where all the guests travelled from.

Former President Barack Obama was also rumoured to be among those attending the event, but has not been spotted.

Orlando Bloom, Stella McCartney, Diane Von Furstenberg and Gayle King were also spotted arriving at the Verdura Resort in Sicily for the welcome dinner on Monday.

On Tuesday, even more guests arrived at the property, with Nick Jonas and new wife Priyanka Chopra leading the charge of celebrities heading to the island for the three-day conference which is believed to have begun on Monday.

Let’s go: The actor joined friends as he boarded the boat following his ride