Happy 30th Birthday Kate Middleton, Style Icon!

Kate wears a smart white blazer and striped skirt combo to the wedding of Hugh Van Cutsem and Rose Astor on June 4, 2005 in Burford, England.

Kate dons a cream-and-brown fascinator at Laura Parker Bowles and Harry Lopes' wedding on May 6, 2006.

Kate is spotted at Cheltenham Racecourse on March 14, 2008 in England wearing this navy blue trench and black fedora.

Kate chose this stunning silk sapphire dress by Issa to announce her engagement to Prince William in the State Apartments of St. James Palace on Nov.16, 2010 in London, England.

Kate arrives in designer Alice Temperley's black and white Temperley Titan dress to a charity event on December 18, 2010 in Fakenham, England.

Kate arrives at City Hall on March 8, 2011 in Belfast, Northern Ireland in this classic Burberry wool trench coat, which reportedly sold out within hours of photos from the visit being published.

Kate donned a red skirt suit by Italian designer Luisa Spagnoli and boots by Aquatalia by Marvin K in this visit to the University of St Andrews on February 25, 2011 in St Andrews, Scotland.

In this close-up shot, you can see the beautiful detailing in Kate's lovely fascinator (a hat-like ornament frequently worn to British weddings).

Here's Kate on the night of her April 29 wedding, showing off her tiny waist with a jewel-encrusted band.

On June 9 the Duchess of Cambridge looked pretty in pink when she attended the ARK 10th Anniversary Gala in London.

On June 11, Kate looked classic in a white, double-breasted jacket and black hat at the Trooping The Colour precession in London.

For the Duke of Edinburgh's 90th birthday on June 12, Kate looked great in this blue ensemble.

On June 25, Kate took on a sailor theme as she visited the Victoria Barracks to present service medals to member so the Irish Guards.

Here she is on June 27 looking stunning in white as she watches Wimbledon with hubby Prince William.

Here she is on June 30 looking beautiful in a navy blue Roland Mouret Manon Dress with a Smythe les Vestes blazer as she boards the plane for her and Prince William's trip to Canada.

On June 30, Kate dons a scoop-backed dress of contrast stone crepe with a navy lace overlay, by Montreal native Erdem Moralioglu, during her first royal visit to Canada.

On July 1, Kate wows the Canadian crowd in a cream dress by Reiss, accessorized with the Queen's Maple Leaf brooch and a hat by Sylvia Fletcher at Lock and Co.  The dress, which Reiss named the "Nannette", retails for $310, and limited stock will be available in the US at Reiss stores.

Kate looks carefree in a blue blazer, skirt and high boots as she attends the final day of Cheltenham Festival on March 16, 2007 in Gloucestershire, England.

Kate is pretty as a princess in a vivid blue frock, as her prince walks alongside wearing a tux with an eggplant tie as they attend the wedding of close friends Harry Meade and Rosie Bradford on October 23, 2010 in Northleach near Cheltenham, England.

The Duchess of Cambridge bundles up in a knee length navy coat, topped off with a lively red scarf. Catherine gives a wave to her husband as he takes part in helicopter maneuvers called "water birding" on July 4, 2011 in Charlottetown, Canada.

Catherine arrives to Province House on July 4, 2011 in Charlottetown, Canada wearing a nautical-inspired, cream knit dress by Sarah Burton.

The dress' creator, Sarah Burton, is the designer of The Duchess' wedding gown. 

On Sunday, July 3 The Duchess of Cambridge and husband Prince William climb aboard the Canadian frigate HMCS Montreal for a morning prayer service in Quebec.

Catherine wore a cobalt-blue Erdem design with a lacy, floral applique neckline. She paired the bright dress with nude patent platform shoes and a matching clutch. This is the second dress from Canadian-born designer Erdem Moralioglu she wore on her Canadian visit. 

Kate is in the navy while leaving Summerfield Community Centre on August 19, 2011 in Birmingham, England.

Keeping it casual but sexy, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit the homeless charity Centrepoint on December 21, 2011 in London, England.

New mom Kate Middleton was rocking a contemporary-casual style at the Ring O'Fire Anglesey Coastal Ultra Marathon on Aug. 30, 2013 in Holyhead, Wales. Sporting a printed blouse, black skinny jeans, a gray blazer and black wedges, the Duchess of Cambridge continues to be a style icon even after giving birth to baby George. Click the pics for more of her envy-worthy looks.