For Kate's first outing in the new year, she wore a deep red Whistles dress to see her first official portrait at the National Portrait Gallery.
Kate visited Hope House, an Action on Addiction women's treatment centre wearing a grey MaxMara wrap dress.
The Duchess looked lovely in a cream coat and fur collar as she attended a friend's wedding in Switzerland.
Kate visited Peaks Lane Fire Station while carrying out a day of engagements in Grimsby, England. She displayed the teensiest of baby bumps under her brown Hobbs coat!
Because it was just too sweet -- Kate and another Princess!
When Kate attended day 4 of the Cheltenham Festival, she wore a Joseph coat that she's had for years. (And that she had altered to fit her growing belly!)
Kate and William attended the St. Patrick's Day Parade, Kate wearing her fit-and-flare Emilia Wickstead coat, last seen on St. Patrick's Day in 2012.
The Duke and Duchess visited the offices of Child Bereavement UK, Kate in a collarless Goat "Redgrave" coat.
The day they visited Child Bereavement, Kate wore a Topshop dress.
The Duchess of Cambridge joined the Queen for an official visit to Baker Street Underground Station, wearing a Malene Berger coat.
Kate wore a Barbour jacket and her trusty wellie boots to volunteer at a scout training day.
Kate and William visited Scotland, Kate wearing this plaid Moloh coat.
For their second day in Scotland, Kate brought back her Armani coat.
Kate attended the National Review of Queen's Scouts at Windsor Castle, showing off her baby bump in a green bespoke Mulberry coat.
Kate visited The Willows Primary School to launch a new school counseling program, wearing a floral Erdem dress.
Kate was pretty in pale blue for a visit to The National Portrait Gallery in support of The Art Room, a charity working with children to increase their self-esteem, self-confidence and independence through art.
Kate's icy blue Emilia Wickstead dress was a big hit.
Later in the month, Kate, William and Harry visited Warner Bros. Studios, and the Duchess chose a polka-dotted Topshop dress and Ralph Lauren blazer.
For a visit to Naomi House Children's Hospice, Kate wore a peach Tara Jarmon coat over a custom frock by an independent dressmaker.
The Duchess stepped out in May in a sunny yellow Emilia Wickstead coat to attend one of the Queen's garden parties at Buckingham Palace.
In June, the royal family attended the service to mark the 60th anniversary of the Queen's Coronation at Westminster Abbey wearing a custom Jenny Packham coat and dress.
The Duchess of Cambridge attended the Princess Cruises ship naming ceremony in a dalmatian printed Hobbs coat.
For Kate's final appearance before welcoming the royal baby, she wore Alexander McQueen to the Trooping the Colour Ceremony.
He's here! Kate and Wills depart the Lindo Wing with their bundle of joy -- Prince George. Kate wore a Jenny Packham frock created just for her.
For the family's first official portrait, Kate wore a Seraphine maternity dress.
Kate's first public appearance was a surprise one, where she and William attended The Ring O'Fire Anglesey Coastal Ultra Marathon in Wales. Kate wore a Zara top, J.Brand skinny jeans and Ralph Lauren blazer.
For her first formal appearance, the Duchess glittered in Jenny Packham.
A casual Kate visited the SportsAid Athlete Workshop where she played a little volleyball and showed off her flat tummy just a few months after giving birth! She wore Ralph Lauren, Smythe and J.Brand.
It was Alexander McQueen for baby George's Christening day, an ivory dress that matched her son's christening gown perfectly.
The following evening, Kate attended a gala dinner in aid of Action on Addiction, wearing navy blue Jenny Packham.
The Duke and Duchess stepped out in support of London Poppy Day, Kate dressed in her red L.K. Bennet coat for the occasion.
For Remembrance Day, Kate wore a black Temperley London coat.
Stepping out with William to visit the Only Connect and ex-offenders projects, Kate recycled her Orla Kiely bird-patterned dress.
The Duchess visited the Place2Be Forum wearing MaxMara and Orla Kiely.
Kate attended SportsBall, wearing a pretty Temperley London dress, and carrying an Alexander McQueen clutch.
William and Kate attended the Royal film performance of 'Mandela: Long Walk To Freedom,' the Duchess wearing Roland Mouret (and a Zara necklace!).
The Duchess attended a screening at the Natural History Museum, re-wearing one of her favorite gowns: the lace Temperley London.
Kate was smartly dressed in red for the Queen's annual Christmas luncheon for the royal family.
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2013 was quite a year for the Duchess of Cambridge. Carrying her first child, Prince George, Kate elevated her style through pregnancy. She inspires women across the world with her grace and elegance, and this year was filled with some of her best looks to date. (We even saw a tiara!)
Click through the gallery above to see Kate's year in review: from the teensiest baby bump to matching little George on his Christening day, the Duchess's year of style was a great one.
Kate Middleton's Style Transformation
William and Kate take Prince George to family Christmas lunch