Here's NR's guide to all you need to know about Kate Middleton! She was born on January 9, 1982. Her full name is Catherine Elizabeth Middleton.
She was captain of her school hockey team and was also top rated at tennis. Her teachers said she always got good grades!
Her mum used to be a flight attendant and her dad used to work for an airline. She has a younger sister called Pippa and a younger brother called James.
She went to St Andrews University in Scotland to study art history. She met Prince William at university.
They became good friends and lived in the same house. Soon they were boyfriend and girlfriend! Kate and Prince William graduated from university together in 2005.
In 2007 Kate and the prince split up for a few months after they started having problems in their relationship. They stayed close friends and got back together in 2008.
Kate has had a while to get used to media attention. The Royal Family have asked photographers to give her some privacy.
Prince William asked Kate to marry him in 2009 while they were on holiday in Kenya. They got married in April 2011 in London.