The protocol even extends as a gesture of respect between the royals themselves, as Kate Middleton curtsied to her father-in-law King Charles when she saw him at the Commonwealth Day Service of Celebration at Westminster Abbey on March 10. Related: Who Bows and Curtsies to Whom? The Guide to the Royal Family's Greeting Rules

Victoria Beckham was pictured curtsying to Queen Camilla at a lavish Buckingham Palace reception on Tuesday, March 11. Camilla, 77, was joined by Victoria, 50, for the 15th anniversary of the Women of the World (WOW) Festival,

The Queen hosted Beckham and a number of other powerful women at Buckingham Palace on March 11. Queen Camilla hosted a powerful group of women who “refuse to take ‘no’ for an answer” at Buckingham Palace—and made a strong statement about her hopes for a “gender-equal world.

Queen Camilla hosts Victoria Beckham at Women Of The World reception in Buckingham. The Queen invited female guests such as, Victoria Beckham to attend the charity at Buckingham.