Prince William famously waited years before finally popping the question and proposing to his longtime love, Kate Middleton.
The engagement should have been a totally happy occasion, of course, but apparently Kate had one big regret about the milestone.
In her book Kate: The Future Queen, royal expert and author Katie Nicholl explained why the joyous event was tinged with sadness for Kate.
First, some backstory: Will popped the question at Kenya's Lake Rutundu on October 20, 2010. The couple were overjoyed, of course, but decided that they would wait a couple of weeks before making the public announcement on November 3.
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