The two joined the royal family at Westminster Abbey for the service.
update at 8:30am PT September 20, 2022
Bear Grylls has apologized for appearing "cherry" in photos from outside the funeral.
On his Instagram Story (per Metro), he wrote that he was a cameraman from his show "Running Wild with Bear Grylls" filming the arrivals for the service and said "it was him that I was acknowledging when I waved."
"I'm so sorry if it looked cheery when it is such a solemn day. I didn't mean that," he added.
Grylls was pictured outside the service, waving to the crowd before heading inside. The 48-year-old adventurer attended the ceremony as a representative for the Scouts, after becoming the youngest ever Chief Scout when he was appointed at age 34 back in 2009.
According to the organization's website, he's considered the "public face of the Scouts in the UK" and has been the Chief Ambassador of World Scouting since 2018. Under the latter position, he's "responsible for promoting the value of being a Scout to a global audience." He was also made an Officer of the Order of the British Empire by the Queen in 2019.
On Monday, Grylls posted about attending the funeral on Twitter, writing, "It's a day we will never forget… a truly beautiful testament to our Nation’s Sovereign, Her Majesty Queen Elizabeth. Rest in Peace. Your duty done. Long Live King Charles."
"I will miss her quiet leadership, her values and integrity, and her wonderful sense of humour," he added in an official statement. "While she was our monarch and Patron, she always made time to listen to our Scouts and recognise their achievements. Her smile would light up the room."
"Let's take great solace and comfort in her warm-heartedness towards young people, her devotion to her duty and most of all her kindness. In memory of our great Patron, let's show that same sense of kindness and respect to each other," he added. "A great book has closed - not just a chapter - and a new one now begins. On behalf of every Scout, we thank HM The Queen for her service. We will never forget her."
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Oh, meanwhile, was spotted arriving as part of the Canada delegation. The "Killing Eve" and "Grey's Anatomy" star wore a black outfit and matching fascinator, with a Canadian flag badge.
The 51-year-old actress -- who was born in Ontario -- was appointed as an officer of the Order of Canada back in June. The actress was recognized for her "artistic career filled with memorable stage, television and film roles in Canada and abroad."
The Canadian delegation was led by Prime Minister Justin Trudeau and his wife Sophie and also included Olympian Mark Tewksbury, actress Sophie Winkleman and musician Gregory Charles.