See Duchess Kate's maternity style through the years

Duchess Kate rocked this gorgeous Max Mara dress on Feb. 19, 2013, during an official visit to the Hope House residential treatment center in London. She was pregnant with Prince George at the time.

Catherine, Duchess of Cambridge, attended the St Patrick's Day Parade at Mons Barracks in this festive green coat and black beret.

Pretty in pink! Duchess Kate chose the perfect look to ring in the 60th anniversary of the queen's coronation at Westminster Abbey on June 4, 2013.

This patterned, mint-green Mulberry coat was a ladylike choice for a trip to the National Review of the Queen's Scouts at Windsor Castle on April 21, 2013.

Duchess Kate wore this Erdem shift dress with a kaleidoscope-like pattern to launch a new school counseling program at The Willows Primary School on April 23, 2013, in Manchester.

This gorgeous, pale-blue gown by designer Emilia Wickstead was an instant classic. The duchess wore it while attending a reception at the National Portrait Gallery on April 24, 2013, in London.

Duchess Kate chose this playful, polka-dot dress to wear to the inauguration of the Warner Bros. Studios Leavesden on April 26, 2013, in London.

Duchess Kate looked bright and sunny in this canary-yellow dress. She wore it to attend a garden party on the Buckingham Palace grounds on May 22, 2013.

This charming maternity coat, by British maternity label Madderson London, was a whimsical choice to wear to Barlby Primary School in London. 

While pregnant with Princess Charlotte, the duchess visited Brookhill Children's Centre while wearing a cute black-and-white polka-dot dress from affordable e-retailer ASOS.

To attend the Commonwealth Service at Westminster Abbey on March 9, 2015, Duchess Kate wore a stunning, blush-colored Alexander McQueen coat. (Clearly a favorite that she's not afraid to wear again.)

It appears Duchess Kate is as big a fan of this Dalmatian-print Hobbs coat as we are. She visited the Turner Contemporary gallery on March 11, 2015, as well as the naming ceremony for Princess Cruises in June 2013 while wearing the frock.

While visiting the set of “Downton Abbey” on March 12, 2015, Duchess Kate dressed perfectly for the occasion in this cream coat by JoJo Maman Bebe.  

The duchess was spotted in this perfectly tailored navy coat by Beulah while leaving St. Paul’s Cathedral after a service of commemoration for troops who were stationed in Afghanistan.

Now pregnant with her third baby, Duchess Kate wore this beautiful burgundy frock with gold details to The Bridge Academy at the annual Place2Be School Leaders Forum at UBS in London.

While on a recent visit to Jaguar Land Rover's Solihull manufacturing plant, Duchess Kate wore the same black military-style coat by Goat Fashion that she wore while visiting The Northside Center for Child Development in New York in December 2014.

This is clearly a girl who knows her polka dots. She paired this sweet dress by Kate Spade with burgundy pumps to The Foundling Museum on Nov. 28, 2017, in London. 

Duchess Kate looked stunning in a cherry-red tunic from British brand Goat at a "Stepping Out" session at Media City on Dec. 6, 2017.

Duchess Kate looked festive at the "Magic Mums" community Christmas party held at Rugby Portobello Trust on Dec. 12, 2017. 

The elegant duchess was seen in a low-key navy peacoat while leaving the Grenfell Tower National Memorial Service held at St. Paul's Cathedral on Dec. 14, 2017.

Is it even possible to have a more perfect holiday coat? Duchess Kate looked festive in this Miu Miu number at Christmas Day church service at St. Mary Magdalene Church. 

This Seraphine maternity dress has made more than one appearance on the duchess – and we can see why! 

This fuchsia-hued Mulberry coat was first seen on the duchess during her visit to the National September 11 Memorial Museum on Dec. 9, 2014. It's clearly a favorite, as she's worn it several times since. 

Duchess Kate speaks during a visit to Roe Green Junior School in London on Jan. 23, wearing an A-line maternity dress by Seraphine.  

Duchess Kate visits The Maurice Wohl Clinical Neuroscience Institute at the Institute of Psychiatry in central London on Jan. 24, wearing a light-blue cashmere-blend maternity coat from Seraphine. 

On Jan. 30, Duchess Kate's first engagement of the royal tour of Sweden, she wore a black coat by Burberry, jeans, a bobble hat by Eugenia Kim and Sorel boots. She added a scarf/hood by Brora and faux-fur trimmed gloves by John Lewis. See more about her fun winter style here.

For a black-tie dinner in Stockholm on Jan. 30, Duchess Kate wore a silk satin gown by designer Erdem featuring a jewel-toned floral pattern on gold with an Edwardian high collar, button-down bodice and semi-trumpet sleeves.

Duchess Kate met with academics and practitioners to discuss Sweden's approach to managing mental health challenges during her royal visit to Sweden and Norway on Jan. 10. She wore a cream Alexander McQueen dress that showed off her baby bump.  

Duchess Kate wore a red-and-white houndstooth coat by Catherine Walker while advocating for mental health at the Karolinska Institute in Solna, Sweden, on Jan. 31. She accessorized her look with a maroon Chanel bag and Tod's pumps.  

Duchess Kate wore an Erdem dress for an evening event on her last night in Stockholm on Jan. 31 at the Fotografiska gallery to celebrate contemporary Swedish culture. Her blue velvet dress with a white floral pattern featured a mock turtleneck and long flared sleeves.

Duchess Kate wore a blue Catherine Walker coat, a brown fur hat with matching gloves and brown suede boots on a tour of the Princess Ingrid Alexandra Sculpture Park on Feb. 1.

Duchess Kate visited a work space for start-up tech companies in Oslo on Feb. 1, wearing a blue lace maternity dress by Seraphine.

Duchess Kate wore a light, flowy evening gown by Alexander McQueen with crystal floral neck embellishments and a diaphanous cape for a gala held on Feb. 1 in her honor at the royal palace in Norway. 

Prince William and Duchess Kate arrived at the BAFTA Awards in London on Feb. 18. The duchess wore a forest-green Jenny Packham dress, paired with a dazzling diamond and emerald necklace, a bracelet, and an earring set.

Duchess Kate attends The Commonwealth Fashion Exchange Reception at Buckingham Palace in a printed, flutter-sleeve dress on Feb. 19 in London.

The duchess wears a matching periwinkle dress and coat to visit the Royal College of Obstetricians and Gynaecologists on Feb. 27 in London. 

Duchess Kate looks lovely in purple at the first annual Royal Foundation Forum on Feb. 28 in London. 

Duchess Kate is ready for spring in this flower-printed dress on Feb. 28.

Catherine, Duchess of Cambridge, and Prince William, Duke of Cambridge, depart from the 2018 Commonwealth Day service at Westminster Abbey on March 12 in London.