Queen Camilla's attempt to break royal protocol was halted by Princess Anne during a rare joint engagement. Anne presented her sister-in-law with an honorary doctorate Wednesday.

Queen Camilla was presented with a special honor by none other than her sister-in-law, Princess Anne. Camilla, 77, was awarded an honorary doctorate of literature by The University of London on Wednesday0.

Princess Anne, who is widely known as the hardest working royal, appears to also be a stickler for the rules because, the royal just refused to break protocol even with Queen Camilla's permission. On Wednesday,

The two women took part in a rare joint engagement at the University of London, where the Princess Royal presented her sister-in-law with an honorary doctorate