Duchess Catherine's maternity style

The Duchess of Cambridge set new standards in royal pregnancy fashion. Here's a look at her most stunning maternity outfits.

Britain's Prince William and Kate, Duchess of Cambridge hold the Prince of Cambridge, Tuesday July 23, 2013, as they pose for photographers outside St. Mary's Hospital exclusive Lindo Wing in London where the Duchess gave birth on Monday July 22. The Royal couple are expected to head to London’s Kensington Palace from the hospital with their newly born son, the third in line to the British throne. (AP Photo/Lefteris Pitarakis)

Trooping The Colour

LONDON, ENGLAND - JUNE 15: Catherine Duchess of Cambridge, travels by carriage along The Mall to the annual Trooping The Colour ceremony at Horse Guards Parade on June 15, 2013 in London, England. (Photo by Julian Parker/UK Press via Getty Images)

The Duchess Of Cambridge Attends Princess Cruises Ship Naming Ceremony

SOUTHAMPTON, ENGLAND - JUNE 13: Catherine The Duchess of Cambridge attends the Princess Cruises ship naming ceremony of, The Royal Princess at Ocean Terminal on June 13, 2013 in Southampton, England. (Photo by Julian Parker/UK Press via Getty Images)

Britain's Prince William, left, and his wife Kate, Duchess of Cambridge, talk to the Dean of Westminster Abbey, Dr John Hall, as they leave following a service to celebrate the 60th anniversary of the coronation of Britain's Queen Elizabeth II at Westminster Abbey, London, Tuesday, June 4, 2013. (AP Photo/Alastair Grant)

Britain's Prince William, left, and his wife Kate, Duchess of Cambridge, talk to the Dean of Westminster Abbey, Dr John Hall, as they leave following a service to celebrate the 60th anniversary of the coronation of Britain's Queen Elizabeth II at Westminster Abbey, London, Tuesday, June 4, 2013. (AP Photo/Alastair Grant)

Service Of Celebration For The 60th Anniversary Of The Queen's Coronation

LONDON, ENGLAND - JUNE 04: Catherine, Duchess of Cambridge attends a service marking the 60th anniversary of the Queen's coronation at Westminster Abbey on June 4, 2013 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

Garden Party at Buckingham Palace

LONDON, ENGLAND - MAY 22: (L-R) Prince Charles, Prince of Wales, Camilla, Duchess of Cornwall and the Catherine, Duchess of Cambridge attend a Garden Party in the grounds of Buckingham Palace hosted by Queen Elizabeth II on May 22, 2013. (Photo by John Stillwell - WPA Pool/Getty Images)

The Duchess Of Cambridge Visits Naomi House

LONDON, ENGLAND - APRIL 29: Catherine, Duchess of Cambridge arrives at Naomi House on April 29, 2013 near Winchester, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

The Duchess Of Cambridge Visits The National Portrait Gallery

LONDON, ENGLAND - APRIL 24: Catherine, Duchess of Cambridge passes a painting of her husband Prince William during an evening reception to celebrate the work of The Art Room charity at The National Portrait Gallery on April 24, 2013 in London, England. (Photo by Toby Melville/WPA Pool/Getty Images)

The Duchess of Cambridge arrives at The Willows Primary School, Wythenshawe, Manchester to launch a school counseling programme, Tuesday April 23, 2013. (AP Photo/Paul Ellis, Pool)

The Duchess of Cambridge strokes a dog as she arrives at The Willows Primary School, Wythenshawe, Manchester to launch a school counseling programme, Tuesday April 23, 2013. (AP Photo/Paul Ellis, Pool)

The Duchess Of Cambridge Attends The National Review Of The Queen's Scouts At Windsor Castle

WINDSOR, UNITED KINGDOM - APRIL 21: Catherine, Duchess of Cambridge talks with scouts as she attends the National Review of Queen's Scouts at Windsor Castle on April 21, 2013. (Photo by Olivia Harris - WPA Pool/Getty Images)

The Earl And Countess Of Strathearn Visit Scotland

GLASGOW, UNITED KINGDOM - APRIL 04: Catherine, Countess of Strathearn visits the Donald Dewar Leisure Centre to launch a new project for their foundation on April 4, 2013 in Glasgow, Scotland. The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry is partnering with Glasgow Sport and the Hunter Foundation on a new pilot as part of its national Coach Core initiative. (Photo by Chris Jackson/Getty Images)

The Duchess Of Cambridge Visits Great Tower Scout Camp

WINDERMERE, UNITED KINGDOM - MARCH 22: Catherine, Duchess of Cambridge visits Great Tower Scout camp on March 22, 2013 in Windermere, Cumbria, United Kingdom. The Duchess of Cambridge attended a scout volunteer training day today in Newby Bridge in Cumbria. The training course is being run in Great Tower, one of the Scout Association’s national activity centres set in 250 acres of land offering a wide range of land and water based activities, including archery, low and high ropes, climbing, abseiling, sailing and canoeing. (Photo by Andy Stenning WPA - Pool/Getty Images)

Britain's Kate, the Duchess of Cambridge, watches as Britain's Queen Elizabeth II unveils a plaque at Baker Street underground station in London, during a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. The Queen made her first public engagement in more than a week Wednesday after cancellations following her hospitalization for a stomach bug. The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube. (AP Photo/Matt Dunham)

Britain's Kate, the Duchess of Cambridge, watches as Britain's Queen Elizabeth II unveils a plaque at Baker Street underground station in London, during a visit to mark the 150th anniversary of the London Underground, Wednesday, March 20, 2013. The Queen made her first public engagement in more than a week Wednesday after cancellations following her hospitalization for a stomach bug. The British head of state joined her husband Prince Philip and their granddaughter-in-law, Kate, for the event marking the 150th anniversary of London's sprawling subway system, affectionately known as the Tube. (AP Photo/Matt Dunham)

The Duke And Duchess Of Cambridge Visit Child Bereavement UK

SAUNDERTON, ENGLAND - MARCH 19: Patron of Child Bereavement UK, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge as they visit the offices of Child Bereavement UK on March 19, 2013 in Saunderton, Buckinghamshire. (Photo by Paul Edwards - WPA Pool/Getty Images)

The Duke And Duchess Of Cambridge Visit Child Bereavement UK

SAUNDERTON, ENGLAND - MARCH 19: Catherine, Duchess of Cambridge receives a teddy bear as she visits the offices of Child Bereavement UK on March 19, 2013 in Saunderton, Buckinghamshire. (Photo by Paul Edwards - WPA Pool/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge attends a St Patrick's Day parade by the 1st Battalion Irish Guards as she visits Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Ben Pruchnie/Getty Images)

The Duchess Of Cambridge Visits Grimsby

GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge arrives at the National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. The pregnant Duchess of Cambridge is spending the day visiting Grimsby in the North East of England. (Photo by Chris Jackson/Getty Images)

The Duchess Of Cambridge Visits Hope House

LONDON, ENGLAND - FEBRUARY 19: Catherine, Duchess of Cambridge visits Hope House residential centre, run by Action on Addiction for recovering addicts on February 19, 2013 in London, England. The Duchess, who is patron of the centre spent over an hour talking to residents at the centre, on her first public engagement since early January. (Photo by Mary Turner - WPA Pool/Getty Images)

FILE- In this Thursday, Dec. 6, 2012 file photo, Britain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. King Edward VII hospital says a nurse involved in a prank telephone call to elicit information about the Duchess of Cambridge has died. The hospital said Friday, Dec. 7, 2012 that Jacintha Saldanha had been a victim of the call made by two Australian radio disc jockeys. They did not immediately say what role she played in the call. (AP Photo/Alastair Grant, File)

FILE- In this Thursday, Dec. 6, 2012 file photo, Britain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. King Edward VII hospital says a nurse involved in a prank telephone call to elicit information about the Duchess of Cambridge has died. The hospital said Friday, Dec. 7, 2012 that Jacintha Saldanha had been a victim of the call made by two Australian radio disc jockeys. They did not immediately say what role she played in the call. (AP Photo/Alastair Grant, File)