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.

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, Camilla was presented an honorary doctorate of literature by her sister-in-law Princess Anne.

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

Princess Anne and Queen Camilla made a rare public appearance together earlier this month, with one expert claiming the Princess Royal showed her true feelings

The Princess Royal knows the regal rules and when Queen Camilla graciously suggested she go against them, there was an equally gracious no from Anne. The Queen and the Princess were at the University

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 and Queen Camilla conducted a joint engagement on Wednesday, where the Queen asked her sister-in-law to break royal protocol - but Anne had a hilarious response

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 Wednesday,

Princess Anne is not going to break royal protocol, not even for Queen Camilla. King Charles III's sister and wife made a joint appearance at the University of London Nov. 20, where Anne, the school's Chancellor,