How Ben Affleck and Jennifer Garner's son ended up playing with Prince George and Princess Charlotte!

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Hollywood royalty meets actual royalty! Ben Affleck and Jennifer Garner's son Samuel got the ultimate celebrity treatment while his famous dad was in London filming Justice League.

The 44-year-old A-list actor visited The Graham Norton Show in an episode that airs on Friday, where he opened up about a very unique experience he and his family happened upon by accident across the pond.

WATCH: EXCLUSIVE: Jennifer Garner on Teaching Her Kids to Be 'Citizens of the World': It's the 'Best Thing You Can Do'

"Despite going to Windsor Castle, Tower of London and Buckingham Palace," Affleck noted in quotes released as a promo for the show, "we didn't see one royal. Then when it was raining I took my youngest [Samuel] to one of those kid's indoor play parks. It was pretty empty and then I noticed this weird vibe from the other grownups."

Affleck quickly realized he was not at just any playground.

See photos of Prince George and Princess Charlotte at a party in Canada:

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Prince George and Princess Charlotte attend party in Canada
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Prince George and Princess Charlotte attend party in Canada
Britain's Prince William (2nd R), Catherine, Duchess of Cambridge (2nd L), Prince George and Princess Charlotte (L) watch as a man inflates balloons at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
VICTORIA, BC - SEPTEMBER 29: Prince George of Cambridge plays with bubbles at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Carcross, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Prince George of Cambridge with Prince William, Duke of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Prince George of Cambridge with Prince William, Duke of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Princess Charlotte of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
Britain's Prince William (R), Catherine, Duchess of Cambridge (2nd L), Prince George and Princess Charlotte (R) attend a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
Britain's Prince George plays with a bubble gun at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
Britain's Prince William (2nd L), Catherine, Duchess of Cambridge, Prince George (L) and Princess Charlotte (R) arrive at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
Britain's Prince William (2nd L), Catherine, Duchess of Cambridge, Prince George (L) and Princess Charlotte (R) arrive at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
Britain's Prince George watches as bubbles are blown at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
Britain's Prince William (2nd L), Catherine, Duchess of Cambridge, Prince George (L) and Princess Charlotte (R) arrive at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
Britain's Prince George watches as bubbles are blown at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
The Duchess of Cambridge with her daughter Princess Charlotte at a children's party for Military families at Government House in Victoria during the Royal Tour of Canada.
The Duchess of Cambridge with her daughter Princess Charlotte at a children's party for Military families at Government House in Victoria during the Royal Tour of Canada.
VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Carcross, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge and Prince George of Cambridge, Prince William, Duke of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Carcross, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, take part in a tea party with their children Prince George and Princess Charlotte at Government House in Victoria, British Columbia, Canada September 29, 2016. REUTERS/Jonathan Hayward/Pool
Britain's Prince William and his wife Kate, the Duke and Duchess of Cambridge, take part in a tea party with their children Prince George and Princess Charlotte at Government House in Victoria, British Columbia, Canada September 29, 2016. REUTERS/Jonathan Hayward/Pool
Britain's Prince George plays with a bubble gun at a children's party at Government House in Victoria, British Columbia, Canada, September 29, 2016. REUTERS/Chris Wattie
Britain's Prince George plays with bubbles as Prince William looks on during a children's tea party at Government House in Victoria, British Columbia, Canada September 29, 2016. REUTERS/Jonathan Hayward/Pool
Britain's Prince William blows up a balloon as he and his wife Kate, the Duchess of Cambridge, take part in a tea party with their children Prince George and Princess Charlotte at Government House in Victoria, British Columbia, Canada September 29, 2016. REUTERS/Jonathan Hayward/Pool
Britain's Prince George plays with bubbles during a children's tea party at Government House in Victoria, British Columbia, Canada September 29, 2016. REUTERS/Jonathan Hayward/Pool
VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge and Prince George of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Prince George of Cambridge with Prince William, Duke of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Prince George of Cambridge with Prince William, Duke of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: Prince George of Cambridge plays with bubbles at a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
VICTORIA, BC - SEPTEMBER 29: (NO UK SALES FOR 28 DAYS) Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge attend a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. (Photo by Pool/Sam Hussein/WireImage)
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"I thought, 'For a kids' place this is tight security!' I was the very last person to realize that Prince George and Princess Charlotte were in there playing with my kid," the father of three revealed. "I can now tell him that he got a cold from the King of England!"

Affleck didn't note if Prince George or Princess Charlotte's parents, Kate Middleton and Prince William, were also at the park, but he did say that he took his kiddos to see some of the historic London landmarks.

MORE: Ben Affleck Implores New Hampshire Citizens to Vote by Doing His Best New England Accent

"We did all the sights and I wanted them to be cultured. Now if it was in America – and I hate to admit this – you'd get a VIP pass, you'd get backstage and they would accommodate you," Affleck told the British crowd. "So I got a tour guide thinking this guy will accommodate me but that wasn't the case! He took us to the middle of the street but we were so far away not only couldn't we see the guard, we couldn't see the fence! We were surrounded by 50,000 tourists looking for selfie opportunities and we never saw the guards change. It was a disaster!"

The Graham Norton Showteased Affleck's appearance via Twitter Wednesday. "This Friday! We have @BenAffleck, Sir David Attenborough, #MattSmith, #ClaireFoy and music from @OfficialSting 10.35pm on @BBCOne #TheGNShow."

Garner, Affleck's estranged wife, recently opened up to ET about teaching their kids to become "citizens of the world." Watch the exclusive interview below!


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