Camilla, the Queen Consort, known formerly as Camilla Parker-Bowles, boasts one of the most popular royal given to her by King Charles ahead of their wedding in 2005.

Source: https://www.express.co.uk/life-style/style/1741635/queen-consort-camilla-engagement-ring-value-pictures

Ross, meanwhile, used the “old bird” clue to guess it was Queen Consort Camilla Parker-Bowles.

Source: https://www.independent.co.uk/arts-entertainment/tv/news/masked-singer-pigeon-who-clues-b2262147.html

The invite also revealed Camilla Parker-Bowles' new title.

Source: https://www.ndtv.com/world-news/joe-biden-set-to-skip-king-charles-coronation-us-first-lady-to-attend-instead-report-3922616

The night she stepped out wearing the dress was the same evening the then-Prince Charles publicly confessed to having an affair with Camilla Parker-Bowles in the documentary Charles: The Private Man, The Public Role.

Source: https://www.express.co.uk/life-style/style/1744885/Princess-Diana-revenge-dress-black-meaning-white