With the Duchess of Cambridge, otherwise known as Kate Middleton, celebrating her 31st birthday Jan. 9, join us for a look at her through the years.
Before Kate Middleton married Prince William and became the Duchess of Cambridge, she was a commoner. Join us for a look at her through the years.
Kate Middleton, age 3 1/2, on a family vacation
Kate Middleton, 4, her father and sister Pippa in Jerash, Jordan
Kate Middleton, age 5
Kate Middleton on the day she graduated from St. Andrews University in June 2005
Kate Middleton and Prince William on their graduation day at St. Andrews University in June 2005
A picture of Kate Middleton wearing a see-through knitted lace dress at the annual St. Andrew's University charity fashion show in 2002 is on show next to a mannequin displaying the creation.
Kate Middleton after the wedding of Camilla Parker Bowles' daughter Laura at St. Cyriac's Church in Lacock, in Wiltshire, west England, on May 6, 2006.
Prince William and Kate Middleton watch the action during the RBS Six Nations Championship rugby match between England and Italy on Feb. 10, 2007, in London, England.
Kate Middleton studies a race card on the final day of the Cheltenham Festival horse racing festival in Gloucestershire, western England, on March 16, 2007.
Kate Middleton watches play on Court One at the Wimbledon tennis championship in London on July 2, 2007.
Prince Harry and Kate Middleton attend the Order of the Garter Service at St George's Chapel on June 16, 2008.
Prince William and Kate Middleton pose for photographs in the State Apartments of St. James Palace on Nov. 16, 2010, in London. The couple's engagement was announced that day.
One of two official engagement photographs of Prince William and Kate Middleton.
In addition to their more formally posed photograph, Prince William and Kate Middleton released this more casual engagement photo.
On Dec. 18, 2010, Middleton and Prince William make their first public outing after announcing their engagement.
Prince William applauds as Kate Middleton pours champagne over the Hereford Endeavour during a naming ceremony and service of dedication for the Royal National Lifeboat Institution's Atlantic 85 Lifeboat in north Wales on Feb. 24, 2011.
Prince William and Kate Middleton attend the naming ceremony and service of dedication of the Hereford Endeavour. This was their first official duty after becoming engaged.
Kate Middleton strokes a dog during a visit to St. Andrews University on Feb. 25, 2011.
Britain's Prince William and Kate Middleton speak to a wedding florist, during a visit to the Greenmount Agriculture & Food College in Antrim, Northern Ireland, on March 8, 2011.
Kate Middleton flips a pancake during a visit with Prince William to City Hall in Belfast, Northern Ireland, on March 8, 2011.
Kate Middleton holds an umbrella during a visit to the Darwen Aldridge Community Academy, in Darwen, northern England on April 11, 2011. Prince William and Middleton were there to officially open the Academy.
Kate Middleton smiles during the visit to Darwen Aldridge Community Academy.
Kate Middleton arrives at Westminster Abbey for her marriage to Britain's Prince William in central London on April 29, 2011.
Prince William and Middleton, newly branded Catherine, Duchess of Cambridge, kiss on the balcony of Buckingham Palace following following their wedding.
Middleton and Prince William applaud after Andy Murray of Britain defeated Richard Gasquet of France on Centre Court at the Wimbledon tennis championships in London on June 27, 2011.
Middleton takes part in Canada Day celebrations on July 1, 2011, in Ottawa.
Prince William and Middleton wave as they board a Canadian Air Force jet at the end of their royal tour of Canada in Calgary on July 8, 2011.
Middleton and Prince William attend a charity event held at the Santa Barbara Polo and Racquet Club in Santa Barbara, Calif., on July 9, 2011.
Middleton talks to guests at a reception in aid of the National Memorial Arboretum Appeal at St. James's Palace in London on Nov. 10, 2011.
Prince William and Middleton arrive for a Christmas Day service at St. Mary Magdalene Church on the Royal estate at Sandringham, Norfolk in east England on Dec. 25, 2011.
Middleton plays field hockey with the Great Britain hockey teams at the Riverside Arena in the Olympic Park in London on March 15, 2012.
Middleton poses with Prince William during a reception before Queen Elizabeth's Diamond Jubilee lunch at Windsor Castle in London on May 18, 2012.
The Duchess of Cambridge watches the London 2012 Paralympic Games rowing finals events at Eton Dorney in southern England on Sept. 2, 2012.
Catherine, the Duchess of Cambridge, visits the Kranji Commonwealth War Cemetery in Singapore on Sept. 13, 2012.
Prince William and the Duchess of Cambridge leave King Edward VII Hospital, where she was hospitalized with acute morning sickness, on Dec. 6, 2012. Middleton's four-day hospital stay led the Royal Family to announce that she was pregnant with the couple's first child.
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