Since Prince William and Kate Middleton announced the Duchess's second pregnancy  back in September, we've been on royal baby bump watch. If we had to crown a modern-day style icon, Kate would be it. Always dressed to the nines in pieces that are contemporary yet classic, her maternity style never disappoints. Sticking to wardrobe staples like chic hats and tailored coats, Kate showed how versatile key pieces could be over the course of nine months. Here, a look back at our favorite royal maternity moments thus far.
Ladylike in Red
At an event for the East Anglia's Children's Hospices, Kate chose a demure red dress and black pumps. A ponytail kept the look youthful and fresh.
Twice as Nice
At a reception in London last month, Kate selected an elegant two-piece ensemble in black and peacock blue. Her belted top created a peplum silhouette, and she accessorized with big chandelier earrings.
Night on the Town
For a black-tie affair at the London Palladium, the Duchess opted for a floor-length lace gown with sheer three-quarter-length sleeves. With her hair swept up in an elegant chignon, Kate's glitzy round diamond earrings took center stage, framing her face.
Kate met young athletes through an organization called SportsAid that she works with in London back in early November. Flat black suede boots and a matching envelope-style clutch allowed her to be active at the event, while her simple, deep-blue shirtdress kept the look appropriate for a princess.
A Moment of Silence
For Remembrance Sunday, which commemorates the contribution of British servicemen in the two World Wars and beyond, Kate stuck to a demure tailored Alexander McQueen coat and coordinating hat. She accented the look with the red poppy that signifies the day while attending services.
For a trip to Wales with Prince William, Kate stayed covered up in a pale blue Matthew Williamson wool coat with oversize gold buttons.
Dare to Bare
We can attribute some of Kate's more recent fashion risks — like this Jenny Packham number — to her new stylist, Kensington Palace personal assistant Natasha Archer. The wrap style of this gown is at once elegant and daring, especially paired with her ankle-tie heels.
Back and Better Than Ever
After staying out of the public eye for several weeks after a second bout of Hyperemesis Gravidarum , the Duchess of Cambridge made her first public appearance to welcome the President of Singapore to London.
She opted for an elegant Alexander McQueen coat dress with Jenny Packham accessories.
Duchess Kate chose an exquisite knee-length Temperley London dress and black suede pumps for a gala in London this October.
Bright in Blue
A cinched waist showed off Kate's bump, which was often covered up, in this shimmery blue Emilia Wickstead dress on April 24, 2013. One of our favorite looks of her first pregnancy!
Blue and Beaded
To mark the 150th anniversary of the London tube on March 20, 2013, Kate dressed up in a beaded teal coat and a black James Lock hat. This look was quite formal for the day but expected, since she was joined by the Queen of England!
Pretty in Polka Dots
At the inauguration of the new Warner Bros. Studios in London on April 26, 2013, Kate mixed high with low when she paired a polka-dot Topshop dress with a black Ralph Lauren jacket, proving you can be stylish on any budget.
Recycling the Red
Not afraid to wear the same thing twice, Kate wore this red Armani coat on April 5, 2013, during a two-day tour of Scotland. She also wore this jacket in December 2006 to watch her then-boyfriend, William, in the Sovereign's Parade. Glad to see pregnancy didn't alter the princess's style one bit!
Keeping It Comfy
During a visit to the Swiss Alps, Kate kept comfy in a patterned top and leggings. This go-to look was complete with boots and classic sunglasses.
Attending a friend's wedding , Kate was stylishly bundled up in a printed Max Mara dress and a fur-trimmed hat and coat. For this look, the accessories were key and kept the outfit from looking too stiff.
Simple in a Shift
Rather than opting for her usual wrap dress, Kate kept her growing bump discreet in a basic shift dress during a visit to the offices of Child Bereavement in Saunderton, Buckinghamshire.
Not Always Maternity
Although Kate was expecting, she didn't part with her entire wardrobe. For St. Patrick's Day in 2013, Kate donned the same green Emilia Wickstead coat that she wore for the previous year's festivities. Coats can be wardrobe staples that transition well into pregnancy.
Shopping for maternity clothes in London, Kate kept it casual in a cape, flat riding boots, and a scarf in February 2013.
Although she's a princess, Kate isn't afraid to rock the casual wear. Visiting Cub Scouts in March 2013, she bundled up in a warm coat and Le Chameau boots and accessorized her look with a red, white, and blue UK National Scouts scarf.
Nothing beats the versatility of classic pieces. For this look she wore to the Cheltenham Festival in England, Kate adapted old favorites for her growing babe. She paired her Lock & Co brown hat with a tan coat, likely a favorite since she's been sporting it since 2007.
Basic in Black
On a maternity shopping spree in London, Kate kept her look classic in an all-black ensemble. Kitten heels and an oversize tote kept the look practical yet pulled together.
Rocking the Wrap
Pregnant or not, you can't go wrong with a wrap dress. Kate showed a hint of her growing baby bump when she wore a Max Mara dress, one of her favorites, to Hope House in London.
Rocking a playful, mint-green Mulberry coat, Kate attended the National Review of Queen's Scouts on April 21, 2013. In fine form, she matched her taupe hat with her clutch and shoes — classic Kate!
Nice and Neutral
At the National Fishing Heritage Centre in England on March 5, 2013, Kate wrapped her bump in a brown Hobbs coat and wore basic black pumps. A belt kept the coat fitted, keeping with her signature tailored style.
Playing With Prints
When done right, prints can be very flattering. Kate's printed Erdem dress flattered her figure and kept her look casual during a school visit on April 21, 2013. Just don't forget to keep the accessories minimal (like a basic clutch) when wearing patterns.
Black and White
Making an appearance with her husband, Prince William, Kate wore a white shift coat — a great day look for Spring.
Pretty in Plaid
Coats are Kate's style staple. She got in the Scottish spirit when she wore a blue and gray plaid coat by Moloh on March 4, 2013, that slightly showed off her bump.
Royal in Red
Kate Middleton smiled with artist Paul Emsley and Prince William when she attended an unveiling of her official portrait  at the National Portrait Gallery on Jan. 11, 2013. Her barely visible bump was highlighted by a belt at her waist.
Kate Middleton celebrated her wedding anniversary  on April 29, 2013, by visiting the Naomi House Children's Hospice in Hampshire, England. She wore a tan shift and a peach Tara Jarmon coat for the occasion.
Kate Middleton joined Prince Charles and Camilla, Duchess of Cornwall, at Queen Elizabeth II's annual garden party on May 22, 2013, in London. For the occasion, Kate wore a yellow tweed Emilia Wickstead coat, topped off with a Jane Corbett headpiece.
Covered in Spots
Returning to the animal-print look that she wore to debut her bump, Kate Middleton wore a dalmatian-print Hobbs shift coat to the christening of a Princess Cruises ship in Southampton, England, on June 13, 2013 — her final solo official appearance before she gave birth. The coat, a common wardrobe pick throughout her pregnancy, graced her bump as she made her way through the ceremony.
Kate Middleton attended Queen Elizabeth II's 60th coronation anniversary  service at Westminster Abbey in London on June 4, 2013. She donned a Jenny Packham daisy-lace dress with silver gray ribbon detail and a peach silk shantung jacket by the same designer.