Kate Middleton turns 43: a look back (16 images)

Prince William (L) and Kate Middleton leave Westminster Abbey following their wedding ceremony in London on April 29, 2011. Middleton's dress was designed by English designer Sarah Burton, creative director of the luxury fashion house Alexander McQueen. File Photo by Kevin Dietsch/UPI

Middleton dons Reiss as she arrives with husband Prince William on Parliament Hill for Canada Day celebrations in Ottawa, Canada, on July 1, 2011. The British royal couple's nine-day tour of Canada was their first official overseas assignment together. File Photo by Christine Chew/UPI

Middleton (L), wearing a cable knit Alexander McQueen sweater dress designed by Sarah Burton, waves alongside William as they leave Province House during their royal tour in Charlottetown, Prince Edward Island, on July 4, 2011. File Photo by Heinz Ruckemann/UPI

On the final leg of their royal tour, Middleton walks on the tarmac in in Jenny Packham dress and LK Bennett shoes as she and William arrive by military helicopter for their white hatting ceremony in Calgary, Alberta, on July 7, 2011. File Photo by Heinz Ruckemann/UPI