Duchess Kate's unexpected Halloween plans revealed

Looks like there will be no trick-or-treating for Duchess Kate this Halloween!

The sporty royal, 35, revealed her plans for October 31 -- and they have nothing to do with dressing up in costume with her two kiddos Prince George and Princess Charlotte. Instead, Kate, who's expecting baby No. 3, will visit the Lawn Tennis Association (LTA) in London. She will meet with a group of children, including the UK's top junior talents, and watch several on-court sessions during her visit.

The Duchess of Cambridge became a patron of the LTA in December 2016 after taking over the patronage from Queen Elizabeth. If you recall, Kate is an avid tennis player herself and is a regular guest at Wimbledon.

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LONDON, ENGLAND - MARCH 28: Catherine, Duchess of Cambridge arrives at the 2017 Portrait Gala at National Portrait Gallery on March 28, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
ASCOT, ENGLAND - JUNE 20: Catherine, Duchess of Cambridge arrives by carriage at Royal Ascot 2017 at Ascot Racecourse on June 20, 2017 in Ascot, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
The Duchess of Cambridge during a tea party at Buckingham Palace for the children of Armed Forces men and women who died serving their country.
Catherine, Duchess of Cambridge, wearing a red embellished tulle midi dress by Marchesa Notte, attends the opening night of 42nd Street in aid of EACH at the Theatre Royal Drury Lane in London on April 4, 2017.
The Duchess of Cambridge (centre) attends a reception at the British Embassy in Paris, during an official visit to the French capital city.
The Duke and Duchess of Cambridge along with Prince Harry arriving at the ICA for a Heads Together charity London Marathon event, London. Photo credit should read: Doug Peters/EMPICS Entertainment
The Duchess of Cambridge with her children Prince George and Princess Charlotte at a children's party for Military families at Government House in Victoria during the Royal Tour of Canada.
The Duchess of Cambridge at the Kitsilano Coast Guard Station, in Vancouver, Canada, during the second day of the Royal Tour to Canada.
LONDON, ENGLAND - NOVEMBER 03: Catherine, Duchess of Cambridge, attends the UK Premiere of 'A Street Cat Named Bob' in aid of Action On Addiction at The Curzon Mayfair on November 3, 2016 in London, United Kingdom. (Photo by David M. Benett/Dave Benett/WireImage)
The Duchess of Cambridge meets Prime Minister of India Narenda Mod in New Delhi's Hyderabad House during day three of the royal tour to India and Bhutan.
PARO, THINBHU - APRIL 16: Catherine, Duchess of Cambridge departs Bhutan from Paro Airport on April 16, 2016 in Paro, Bhutan. (Photo by Samir Hussein/WireImage)
LONDON, UNITED KINGDOM - JUNE 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend a national service of thanksgiving to mark Queen Elizabeth II's 90th birthday at St Paul's Cathedral on June 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - MARCH 14: Catherine, Duchess of Cambridge attends the Commonwealth Observance Day Service on March 14, 2016 in London, United Kingdom. The service is the largest annual inter-faith gathering in the United Kingdom and will celebrate the Queen's 90th birthday. Kofi Annan and Ellie Goulding will take part in the service. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 07: Catherine, Duchess of Cambridge arrives at the Royal Albert Hall for the Annual Festival of Remembrance on November 7, 2015 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)
ASCOT, UNITED KINGDOM - JUNE 15: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends day 2 of Royal Ascot at Ascot Racecourse on June 15, 2016 in Ascot, England. (Photo by Max Mumby/Indigo/Getty Images)
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a creative industry event to celebrate cultural collaboration between the UK and China at Lancaster House in London (Photo by Zak Hussein/Corbis via Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 13: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leaving the Royal Variety Performance at the Palladium Theatre on November 13, 2014 in London, England. (Photo by Mark Robert Milan/FilmMagic)
CANBERRA, AUSTRALIA - APRIL 24: (NO UK SALES FOR 28 DAYS) Catherine, Duchess of Cambridge attends a reception hosted by the Governor General Peter Cosgrove at Government House on April 24, 2014 in Canberra, Australia. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their son, Prince George of Cambridge. (Photo by Pool/Samir Hussein/WireImage)
LONDON, UNITED KINGDOM - DECEMBER 11: Catherine, Duchess of Cambridge, wearing a black lace Temperley evening gown for the third time, attends the screening of David Attenborough's Natural History Museum Alive 3D at the Natural History Museum on December 11, 2013 in London, England. (Photo by Anwar Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 28: Catherine, Duchess of Cambridge attends the annual SportsAid dinner at Victoria Embankment Gardens on November 28, 2013 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 08: Catherine, Duchess of Cambridge accompanied by her Private Secretary Rebecca Deacon attends a gala dinner in aid of the University of St. Andrews 600th Anniversary Campaign at Middle Temple Hall on November 08, 2012 in London, England. (Photo by Indigo/Getty Images)
KUALA LUMPUR, MALAYSIA - SEPTEMBER 14: Catherine, Duchess of Cambridge attends a tea party at the British High Commission on day 4 of Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge's Diamond Jubilee Tour of the Far East on September 14, 2012 in Kuala Lumpur, Malaysia. Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are on a Diamond Jubilee Tour of the Far East taking in Singapore, Malaysia, the Solomon Islands and the tiny Pacific Island of Tuvalu. (Photo by Danny Lawson - Pool/Getty Images)
LONDON, UNITED KINGDOM - JUNE 05: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a Service of Thanksgiving to celebrate Queen Elizabeth II's Diamond Jubilee at St Paul's Cathedral on June 5, 2012 in London, England. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. Thousands of wellwishers from around the world have flocked to London to witness the spectacle of the weekend's celebrations. (Photo by Indigo/Getty Images)
LONDON, UNITED KINGDOM - MAY 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge arrives at 'Our Greatest Team Rises - BOA Olympic Concert' at Royal Albert Hall on May 11, 2012 in London, England. (Photo by Indigo/Getty Images)
LONDON, ENGLAND - MAY 11: Catherine, Duchess of Cambridge arrives at 'Our Greatest Team Rises -BOA Olympic Concert' at the Royal Albert Hall on May 11, 2012 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - JANUARY 08: Catherine, Duchess of Cambridge attends the UK premiere of War Horse at Odeon Leicester Square on January 8, 2012 in London, England. (Photo by Tim Whitby/Getty Images)
LONDON, ENGLAND - DECEMBER 06: Catherine, Duchess of Cambridge arrives for a Gary Barlow Concert in support of The Prince's Trust, at the Royal Albert Hall on December 6, 2011 in London, England. (Photo by Chris Jackson/Getty Images)
QUEBEC CITY, QC - JULY 03: Catherine, Duchess of Cambridge attends a Freedom of the City Ceremony outside City Hall on July 3, 2011 in Quebec, Canada. (Photo by George Pimentel/WireImage)
OTTAWA, ON - JUNE 30: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the wreath laying ceremony at the National War Memorial on day 1 on the Royal Couple's North American Tour on June 30, 2011 in Ottawa, Canada. (Photo by Samir Hussein/WireImage)
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge greet wellwishers from the balcony next to Grace Van Cutsem (L) and Margarita Armstrong-Jones at Buckingham Palace on April 29, 2011 in London, England.
WINDSOR, UNITED KINGDOM - NOVEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at Windsor Castle to attend Queen Elizabeth II's and Prince Philip, Duke of Edinburgh's 70th wedding anniversary dinner on November 20, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)
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It seems as if she's also passing down her love of tennis to her two children, revealing earlier this year that she's already teaching little George how to play the sport.

The pregnant royal has upped her public appearances this month, after announcing in early September that she's expecting her third child. The future royal, who Kensington Palace recently revealed is due in April, will be fifth in line to the British throne.

Kate made two surprise appearances in one week -- the first at an event with Paddington Bear involving children from the charities they support and the other at a ceremony to help celebrate 150 young sports coaches graduating from Coach Core, a program founded by the royals themselves.

RELATED: Duchess Kate's style before becoming a royal:

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Duchess Kate's style before she became a royal
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Duchess Kate's style before she became a royal

Kate Middleton right before her graduation ceremony in 2005 rocking an oh-so-reliable white tank top (with a little bit of her tummy showing) and bootcut jeans.

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Howdy! Here's Kate Middleton at a music festival in 2005 looking very outdoorsy in a cowboy hat with some matching suede riding boots. 

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Kate Middleton definitely rocked cropped tops before it was even a trend! Here she is with her mom, Carole, in a simple white crop top that she paired underneath a blue blazer.

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Here's a full-length photo of her casual -- yet -- stylish look.

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Kate Middleton braved the frigid temps in 2006 with a cozy outfit of a Russian-style fur hat, a wool coat and a pair of her go-to suede boots.

(Getty)

CHELTENHAM, ENGLAND - MARCH 17: Prince William's girlfriend, Kate Middleton wears a Russian style fur hat to the final day of Cheltenham Races on March 17, 2006 in Cheltenham, England. (Photo by Tim Graham/Getty Images)

Polka dot beauty! Kate Middleton cheered her future husband Prince William on at a polo match in 2006 in a bright red wrap dress.

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Flower power! Kate Middleton attended a 2006 party in a floral frock that hit just above her knees. She paired the look with a light pink crushed velvet jacket and some seriously pointy flats.

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Kate Middleton's off-duty style was impeccable. At another polo match in 2006, she rocked white flared jeans and a tummy-bearing sheer top.

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A close-up look at Kate's super casual ensemble.

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Kate Middleton looked fabulous in a black dress with tights and suede knee-high boots while out on the town in 2007.

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Kate Middleton made denim skirts a thing before they even became trendy. Here she is on a casual shopping trip in 2007.

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What a party animal! Before becoming a royal, Kate Middleton was just a regular 20-something who went out at the hottest clubs in London. Of course, she always looked great for the occasion. 

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Before Kate Middleton was wearing tiaras and fancy pearls, she was the queen of accessorizing. Between the scarf and the French-inspired beret, she looked absolutely flawless in 2007.

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Another close up look of Kate's chic accessorizing.

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Uggs -- oh my! Even Kate Middleton couldn't resist the comfy boots that blew up in popularity in the early 2000s. Here she is in 2007.

(Getty)

While Kate rocks multi-million dollar jewels now, she still loved to accessorize even before she became a royal. We're totally loving that chunky white necklace!

(Getty)

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The brunette beauty was photographed adorably dancing with Paddington Bear in an Orla Kiely floral frock in a pastel pink hue that was embellished with a contrasting black bow detail waist and three quarter length sleeves.

Just days later, she braved the chilly fall temps in a blue double-breasted blazer by designer Philosophy di Lorenzo, paired with a black turtleneck, black skinny jeans and heeled black booties. The blazer, which she also owns in red, reportedly retails for over $700.

For more on Kate's Halloween plans, watch the video above!

RELATED: Duchess Kate's first public appearance after announcing baby No. 3:

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Duchess Kate's first public appearance since announcing baby No. 3
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Duchess Kate's first public appearance since announcing baby No. 3
The Duke and Duchess of Cambridge attend a reception on World Mental Health Day at Buckingham Palace, London, to celebrate the contribution of those working in the mental health sector across the UK.
The Duchess of Cambridge attends a reception on World Mental Health Day at Buckingham Palace, London, to celebrate the contribution of those working in the mental health sector across the UK.
The Duke and Duchess of Cambridge attend a reception on World Mental Health Day at Buckingham Palace, London, to celebrate the contribution of those working in the mental health sector across the UK.
The Duke and Duchess of Cambridge attend a reception on World Mental Health Day at Buckingham Palace, London, to celebrate the contribution of those working in the mental health sector across the UK.
The Duke and Duchess of Cambridge attend a reception on World Mental Health Day at Buckingham Palace, London, to celebrate the contribution of those working in the mental health sector across the UK.
The Duke and Duchess of Cambridge attend a reception on World Mental Health Day at Buckingham Palace, London, to celebrate the contribution of those working in the mental health sector across the UK.
The Duchess of Cambridge and Prince Harry attend a reception on World Mental Health Day at Buckingham Palace, London, to celebrate the contribution of those working in the mental health sector across the UK.
Britain's Catherine, Duchess of Cambridge attends a reception at Buckingham Palace to celebrate World Mental Health Day in central London on October 10, 2017 / AFP PHOTO / POOL / Heathcliff O'Malley (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 10: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge support World Mental Health Day at Buckingham Palace on 10, October 2017 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
Britain's Catherine, Duchess of Cambridge attends a reception at Buckingham Palace to celebrate World Mental Health Day in central London on October 10, 2017 / AFP PHOTO / POOL / Heathcliff O'Malley (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 10: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge support World Mental Health Day at Buckingham Palace on 10, October 2017 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
Britain's Catherine, Duchess of Cambridge takes part in a reception at Buckingham Palace to celebrate World Mental Health Day in central London on October 10, 2017 / AFP PHOTO / POOL / Heathcliff O'Malley (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge takes part in a reception at Buckingham Palace to celebrate World Mental Health Day in central London on October 10, 2017 / AFP PHOTO / POOL / Heathcliff O'Malley (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
Britain's Prince William (L), Duke of Cambridge and Catherine, Duchess of Cambridge attend a reception at Buckingham Palace to celebrate World Mental Health Day in central London on October 10, 2017 / AFP PHOTO / POOL / Heathcliff O'Malley (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)
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