Save the date for Kate Middleton's baby bump debut

The Duchess of Cambridge has kept a low profile since announcing the news of her third baby (and her pregnancy condition, hyperemesis gravidarum), but Kate Middleton’s first scheduled public appearance is sooner than you think. 

According to Kensington Palace, Middleton will join her husband, Prince William, and her brother-in-law, Prince Harry, in celebrating World Mental Health Day on October 10. The royal trio will honor those who work in the mental health sector by holding a reception at Buckingham Palace. 

35 PHOTOS
Duchess Kate and Pippa Middleton together
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Duchess Kate and Pippa Middleton together
BUCKLEBURY, BERKSHIRE - DECEMBER 25: Catherine, Duchess of Cambridge , Princess Charlotte of Cambridge, Pippa Middleton and James Middleton attend Church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Samir Hussein/Samir Hussein/WireImage)
ENGLEFIELD, ENGLAND - DECEMBER 25: Prince William, Duke of Cambridge, Prince George of Cambridge, Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, James Middleton and Pippa Middleton attend a Christmas Day service at St. Marks Church on December 25, 2016 in Englefield, England. (Photo by Anwar Hussein/WireImage)
KING'S LYNN, UNITED KINGDOM - JANUARY 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Pippa Middleton (L), Sophie Carter (3rd L) James Meade and Catherine, Duchess of Cambridge attend the Sunday service at St Mary Magdalene Church, Sandringham on January 10, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)
Kate and sister Pippa Middleton laugh in the Royal box in the Final at Wimbledon, 2012 (Photo by AMA/Corbis via Getty Images)
The Duchess of Cambridge and sister Pippa Middleton (left) attending the the Men's Singles Final during day thirteen of the 2012 Wimbledon Championships at the All England Lawn Tennis Club, Wimbledon.
Catherine, Duchess of Cambridge and her sister Pippa Middleton (L) watch from the Royal Box during the men's singles final match between Britain's Andy Murray and Switzerland's Roger Federer on Centre Court on day 13 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 8, 2012. AFP PHOTO / LEON NEAL RESTRICTED TO EDITORIAL USE (Photo credit should read LEON NEAL/AFP/Getty Images)
Kate and sister Pippa Middleton laugh in the Royal box in the Final at Wimbledon, 2012 (Photo by AMA/Corbis via Getty Images)
The Duchess of Cambridge and sister Pippa Middleton (left) attending the the Men's Singles Final during day thirteen of the 2012 Wimbledon Championships at the All England Lawn Tennis Club, Wimbledon.
Catherine, Duchess of Cambridge and her sister Pippa Middleton (L) watch from the Royal Box during the men's singles final match between Britain's Andy Murray and Switzerland's Roger Federer on Centre Court on day 13 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 8, 2012. AFP PHOTO / LEON NEAL RESTRICTED TO EDITORIAL USE (Photo credit should read LEON NEAL/AFP/GettyImages)
Kate and sister Pippa Middleton walk into the Royal box in the Final at Wimbledon, 2012 (Photo by AMA/Corbis via Getty Images)
LAMBOURN, UNITED KINGDOM - JUNE 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Pippa Middleton and Catherine Duchess of Cambridge attend the wedding of Sam Waley-Cohen and Annabel Ballin at St. Michael and All Angels church on June 11, 2011 in Lambourn, England. (Photo by Indigo/Getty Images)
LAMBOURN, UNITED KINGDOM - JUNE 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Pippa Middleton and Catherine Duchess of Cambridge attend the wedding of Sam Waley-Cohen and Annabel Ballin at St. Michael and All Angels church on June 11, 2011 in Lambourn, England. (Photo by Indigo/Getty Images)
Kate Middleton, left, arrives for her wedding with Britain's Prince William as her maid of honor Pippa Middleton holds the train at Westminster Abbey in London. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
LONDON, UNITED KINGDOM - 2011/04/29: Bride Kate Middleton arrives with her father Michael Middleton in a royal Rolls Royce at Westminster Abbey. (Photo by Pawel Libera/LightRocket via Getty Images)
(L-R) Kate Middleton's parents Michael and Carole Middleton, Prince Charles and Camilla, Duchess of Cornwall, , Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, Queen Elizabeth II and Prince Philip, Duke of Edinburgh, Maid of Honour Pippa Middleton and Best man Prince Harry on the balcony at Buckingham Palace, just after the wedding of Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge. (Photo by Stephane Cardinale/Corbis via Getty Images)
Kate Middleton (R) arrives at the Goring Hotel with her mother Carole (2L) and sister Pippa (C) in central London, on April 28, 2011, where she will be staying prior to her wedding. Britain's Prince William will marry his fiancee Kate Middleton in London's Westminster Abbey on April 29, 2011. AFP PHOTO/CARL COURT (Photo credit should read CARL COURT/AFP/Getty Images)
Kate Middleton (centre) arrives at the Goring Hotel, London, with her mother Carole (left) and Pippa her younger sister where the family will spend the night before Kate's wedding to Prince William at Westminster Abbey on Friday.
(NO SALES) In this Handout Image provided by Clarence House www.officialroyalwedding2011.org, Kate Middleton with sister Pippa and Father Michael in Jerash, Jordan. The Middleton Family moved to Amman, Jordan for two and a half years.
ASCOT, UNITED KINGDOM - MAY 10: Pippa Middleton, Kate Middleton and Thomas van Straubenzee watch Prince William play in the Audi Polo Challenge charity polo match at Coworth Park Polo Club on May 10, 2009 in Ascot, England. (Photo by Indigo/Getty Images)
ASCOT, UNITED KINGDOM - MAY 10: Pippa Middleton, Kate Middleton and Thomas van Straubenzee watch Prince William play in the Audi Polo Challenge charity polo match at Coworth Park Polo Club on May 10, 2009 in Ascot, England. (Photo by Indigo/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 18: Kate Middleton and Pippa Middleton are seen on September 18, 2008 in London, England. (Photo by Mark Milan/FilmMagic)
Kate Middleton, Her Sister Pippa And Their Friends Arrive At The Renaissance Rooms In South London, For The Day-Glo Midnight Roller Disco, An Event Organised In Aid Of A Charity In Oxford Set Up In Memory Of Thomas Waley-Cohen, Who Died From Bone Cancer In 2004 At The Age Of 20. (Photo by Antony Jones/UK Press via Getty Images)
LONDON - NOVEMBER 28: (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Kate Middleton (R) and her sister Pippa attend the book launch party of 'Time To Reflect' by photographer Alistair Morrison, at Bluebird on November 28, 2007 in London, England. (Photo by Dave M. Benett/Getty Images)
LONDON - MAY 14: (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Pippa and Kate Middleton (R) attend the book launch party of The Young Stalin: The Adventurous Early Life Of The Dictator 1878-1917 by Simon Sebag Montefiore, at Asprey May 14, 2007 in London, England. (Photo by Dave M. Benett/Getty Images)
Kate Middleton With Sister Pippa At Windsor After Watching Prince William Play Rugby.. (Photo by Antony Jones/UK Press via Getty Images)
RICHMOND, UNITED KINGDOM - JUNE 17: Kate Middleton and her sister Pippa Middleton watch Prince William compete in the Chakravarty Cup charity polo match at Ham Polo Club on June 17, 2006 in Richmond, England. (Photo by Indigo/Getty Images)
RICHMOND, UNITED KINGDOM - JUNE 17: Kate Middleton and her sister Pippa Middleton watch Prince William compete in the Chakravarty Cup charity polo match at Ham Polo Club on June 17, 2006 in Richmond, England. (Photo by Indigo/Getty Images)
RICHMOND, UNITED KINGDOM - JUNE 17: Kate Middleton and her sister Pippa Middleton watch Prince William compete in the Chakravarty Cup charity polo match at Ham Polo Club on June 17, 2006 in Richmond, England. (Photo by Indigo/Getty Images)
RICHMOND, UNITED KINGDOM - JUNE 17: Kate Middleton and her sister Pippa Middleton watch Prince William compete in the Chakravarty Cup charity polo match at Ham Polo Club on June 17, 2006 in Richmond, England. (Photo by Indigo/Getty Images)
ETON, UNITED KINGDOM - MARCH 18: Prince William greets Kate Middleton and her sister Pippa Middleton after playing the Field Game in an old boys match at Eton College on March 18, 2006 in Eton, England. (Photo by Indigo/Getty Images)
ETON, UNITED KINGDOM - MARCH 18: Prince William embraces Kate Middleton, as her sister Pippa Middleton looks on, after playing the Field Game in an old boys match at Eton College on March 18, 2006 in Eton, England. (Photo by Indigo/Getty Images)
ETON, UNITED KINGDOM - MARCH 18: Prince William embraces Kate Middleton, as her sister Pippa Middleton looks on, after playing the Field Game in an old boys match at Eton College on March 18, 2006 in Eton, England. (Photo by Indigo/Getty Images)
ETON, UNITED KINGDOM - MARCH 18: Prince William talks with Kate Middleton and her sister Pippa Middleton after playing the Field Game in an old boys match at Eton College on March 18, 2006 in Eton, England. (Photo by Indigo/Getty Images)
CHELTENHAM, ENGLAND - MARCH 17: (L-R) Pippa Middleton and Prince William's girlfriend Kate Middleton, wearing a Russian-style fur hat, attend the final day of Cheltenham Races on March 17, 2006 in Cheltenham, England. (Photo by Tim Graham/Getty Images)
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Middleton is a known mental health advocate and regularly encourages others to destigmatize the issue. She even appeared (waist-up) in a PSA earlier this week to stress the importance of openly discussing mental illness.

Naturally her much-publicized baby bump debut will also bring awareness to the cause so close to her heart. And why not use her power of maternity fashion for good? 

RELATED: 17 of Kate Middleton’s Absolute Best Maternity Looks

95 PHOTOS
The best photos of Prince George
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The best photos of Prince George

What's Christmas Day without a candy cane?!

December 2016

(PA Wire/PA Images)

Look.at.that.smile.

Fall 2016

(PA Wire/PA Images)

No caption necessary.

Fall 2016

(PA Wire/PA Images)

Father and son bonding time!

Fall 2016

(PA Wire/PA Images)

An adorable handout photo released by the Duke and Duchess of Cambridge of Prince George, who celebrates his third birthday today July 22nd, standing on a swing. 

July 2016

Prince George celebrates his birthday with a sweet treat -- and the family pet, Lupo! 

July 2016

The birthday boy sits on the swing bearing his mother and father's names. 

July 2016

He's growing up so fast!! George is adorable in stripes and khaki shorts.

July 2016

Prince George's first official engagement! That's a total face of "I've got this."

July 2016

Someone's excited!

July 2016

Favorite. The young royal had so much fun exploring the planes with mom and dad! 

July 2016

George waves to his adoring crowd.

July 2016

Just George and his dad.

July 2016

He wasn't too sure about the noise, though. "Uhhhh wait Mom, pick me up!" 

July 2016

The planes were a little too loud!

July 2016

And he got a sweet sticker, too!

July 2016

Phew. Long day!

July 2016

Charlotte makes her balcony debut at the Queen's 90th birthday Trooping the Colour, but George stole the show with his excitement over the planes!

June 2016

When the sun is blinding but you're still like "LOOK MOM!"

June 2016

We love this one -- he just looks so happy!

June 2016

Best. Moment. Ever.

June 2016

George can't believe how cool this day is. (And someday this parade will be for him!)

June 2016

Such a bright sun, but he has to see those planes!

June 2016

Kate chats with little George as he gets ready for bedtime (after a fun ride on his rocking horse, of course!)

April 2016

George shows the Obamas just how much he loves the gift they gave him -- looking mighty cute as he does.

April 2016

This might be one of the best photos um ... ever. Prince George meets President Obama in his adorable gingham jammies and a matching robe with his name on it? Does it get any cuter?!

April 2016

Kate holds little Charlotte while George snuggles in between his parents during a family vacation skiing in the French Alps.

March 2016

George looks like he's found a new favorite hobby!

March 2016

Prince George heads to his first day of school, taken by the Duchess of Cambridge. George is attending the Westacre Montessori nursery school near Sandringham in Norfolk.

January 2016

The little Prince seemed quite enthralled with the mural near his school!

January 2016

Kate and William with their two children, Prince George and Princess Charlotte, in a photograph taken at Kensington Palace in London.

October 2015

Prince George, who celebrated his second birthday on July 22, 2015 hams it up for the camera in his dad's arms!

July 2015

George plays with his hair in this first photo released of the Cambridges as a family of four, on the day they celebrated little Princess Charlotte's christening. 

July 2015

George was adorably a bit fussy after his sister's christening -- he was looking for the rest of the family to make sure they were coming too!

July 2015

George stares that camera down.

July 2015

Spotted: Cameras, crowds ... "who are these people?"

July 2015

Still looking for his family! Kate and William soothe the little royal, promising they'll be along soon.

July 2015

"You okay, Char?" George checks on his little sister in her pram.

July 2015

Kate and George watched William play in a polo match, playing their own games on the sidelines!

June 2015

George makes a hilarious/adorable face at his dad after the match.

June 2015

Whoa there! Kate stops a tumble for her two-year-old while playing on the hill.

June 2015

Prince George plays with his cousin Isla Phillips.

June 2015

George makes his balcony debut! The little prince worked on his royal wave as he joined his family to celebrate Trooping the Colour.

June 2015

Music, a parade and a multi-plane flyover for your great-grandmother's birthday? Pretty cool day for George.

June 2015

Still a bit of confusion for this little one as he peers at the massive crowd below.

June 2015

So sassy! George watched his parents in the parade before heading out onto the balcony, making the funniest face when he saw them.

June 2015

He's learning fast! George waves goodbye to his adoring public.

June 2015

How could you not love him?!

June 2015

The first set of photos released of little Princess Charlotte were in her big brother's arms -- and taken by mom, Kate.

June 2015

George gives his baby sister a kiss. Too cute!

June 2015

On the day Princess Charlotte was born, William ran home to give the good news to George, then brought him to meet his new sister.

May 2015

William gives George a kiss before they head inside for the big moment!

May 2015

Christmas photographs of Prince George sitting on the Kensington Palace steps, released by his proud parents William and Kate. 

November 2014

Christmas photographs of Prince George sitting on the Kensington Palace steps, released by his proud parents William and Kate. 

November 2014

Christmas photographs of Prince George sitting on the Kensington Palace steps, released by his proud parents William and Kate. 

November 2014

Prince George was up on his feet watching William play polo on Father's Day. 

June 2014

Kate holds wiggly George at the polo match.

June 2014

"Okay bye mom!" 

June 2014

"Um Mom, who is this lady?" 

April 2014

The always fashionable George was decked out in red for the last day of the royal tour. 

April 2014

"Wait! I think I dropped my toy - no seriously, I can see it from here!" 

April 2014

This cutie touches down in Australia's capital. 

April 2014

William, Kate and George visited the Taronga Zoo in Sydney and George got to meet a bilby! He was really excited about it. 

April 2014

Just a dad and his boy!

April 2014

Testing out his Princely roar.

April 2014

Just look at those chubby little cheeks!

April 2014

We couldn't help but laugh out loud at George's mean mug right here.

April 2014

Playing with his toy bilby.

April 2014

"Okay mom. It's really bright out here... AND I'm wearing ruffles. Can we talk about this?"

April 2014

"What's up, Australia?"

April 2014

Ah, the Princely handshake.

April 2014

We're obsessed with William and George's matching fly-away hair as they left New Zealand.

April 2014

Looks like it's nap o'clock!

April 2014

"Here, mom, let me help you."

April 2014

Too cute for words.

April 2014

This photo is Kate's favorite from their royal tour, where baby George had just woken up from his nap and was so happy to hug his mom.

April 2014

Little George during his New Zealand playdate!

April 2014

Baby George arrives in New Zealand.

April 2014

This photo might just be our favorite -- Georgie looks like he's trying to dive out of Kate's arms! Good thing she has a solid grip.

April 2014

Such a cutie!

April 2014

The palace released this official photo just a week before the family takes off for Australia and New Zealand. Oh how he's grown! Cutie George gazes at his pup, Lupo (in a dashing sweater with his name on it).

March 2014

Kate and William proudly presented George on his christening day.

October 2013

Quite the outfit, Georgie!

October 2013

William and George.

October 2013

William and George.

October 2013

Kate, in Alexander McQueen, and George in the royal christening dress.

October 2013

Kate and George.

October 2013

George's first official portrait! Lupo got to be in this one, too. 

August 2013

Kate debuts her son, Prince George Alexander Louis of Cambridge.

July 2013

Kate, William and George.

July 2013

Kate, William and George.

July 2013

Kate wore a simple, pretty, polka-dotted dress by Jenny Packham.

July 2013

William carries George to the car.

July 2013

Cutie heads home!

July 2013

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