William, disclosed the royal couple's viewing habits when he spoke to Downton Abbey's executive producer Gareth Neame at a reception during their recent trip to New York.
"He said that he was really looking forward to the episode that we run on Christmas Day which is the season finale," Gareth told Vanity Fair. "So we know that William and Kate are fans."
Prince William and Duchess Kate will be watching Downton this Christmas
This is not the first time that Prince George's dad has talked about his admiration for Downton.
Allen Leech — who stars as Tom Branson in the award-winning show — revealed that William and Kate watch Downton religiously during an interview on Andy Cohen's Watch What Happens Live!.
"I was actually at an event last week with Prince William, now the Duke of Cambridge," said Allen. "I met him last week… shook his hand. He actually said, 'I'm a big fan of the show. Only now that my wife's had a baby'."
The Duchess of Cornwall told Lesley Nicol that she enjoys the show
Prince William's stepmother the Duchess of Cornwall has also revealed a love of Downton.
"Camilla loves Downton Abbey," Lesley Nicol, who plays Mrs Patmore, told The Express. "We have spoken and she genuinely loves the show.
"When I was talking to Prince Charles he had a slightly glazed look, although being very nice," she added. "Then somebody said, 'Sir, do you know Downton Abbey?' and he replied, 'Oh, I sort of come and go, really.' So I thought, 'I'm on a loser now,' but I think a lot of the royals do watch it."