Prince Harry and The Late Late Show host – who is famous for his recurring Carpool Karaoke segment – were spotted on the top deck of an open-air double-decker tour bus in Hollywood on Friday.
Harry and James were surrounded by a full crew, including three cameramen, as they made their way out of the CBS Studios lot.
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According to TMZ, the group were even joined by a police escort.
Harry appeared comfortable in front of the cameras, laughing and joking with James – who has been a close friend for years and even attended Harry's wedding to Meghan Markle in 2018.
It is unclear what the pair were filming for, whether it is something for Harry and Meghan's Netflix deal or part of The Late Late Show.
Harry and James enjoyed a laugh during filming (Photo: MEGA)
Friday's outing comes after Harry delighted rugby fans with a surprise video appearance to talk about the sport's importance.
The Duke said the "passion and enjoyment" of sport can bring comfort to people in the "isolated" times we live in. Fans were delighted by his appearance, and many were quick to point out the difference California sunshine has had on his appearance.
"He is tanned. Must be the Cali sunshine," tweeted one social media user. "Prince Harry is glowing, lots of loving care and California sunshine," said another, with a third adding: "Looking good Prince Harry."
Fans commented on Harry's California 'glow' during a surprise video appearance on Friday
The home features a grand total of nine bedrooms and 16 bathrooms. There is also believed to be a separate guest house with two bedrooms and two bathrooms.
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