In an interview with NBC's Brian Williams, Charles appeared off-guard when asked about the potential status change to co-monarch for Camilla, The Daily Telegraph reported.
"That's, well … we'll see, won't we? That could be," the heir-apparent said.
The 62-year-old is the heir to his mother, Queen Elizabeth, who has made no indication of stepping down at the age of 84.
Camilla Parker-Bowles and Charles were reportedly romantically linked before and during his marriage to Diana Spencer in 1981. Diana was killed in a Paris car crash in 1997 and Charles married Camilla eight years later.
Diana assumed the title and role of Princess of Wales, but the royal family opted not to re-bestow that title on Camilla, instead referring to her as the Duchess of Cornwall, or "Princess Consort," the newspaper said.
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