Pippa Middleton shows off toned arms in chic gown weeks before her wedding -- see the pic!

Pippa Middleton is definitely in wedding shape!

The 33-year-old showed off her toned arms in a chic, sleeveless gown just weeks before her wedding to James Matthews.

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Middleton looked stunning in her elegant Erdem dress at the ParaSnowBall fundraiser at the Hurlingham Club in London Thursday, accessorizing her look with minimal jewelry and a simple clutch. The brunette beauty has been an avid supporter of the charity sponsoring the event, Disability Snowsport UK.

London Celebrity Sightings -  May 04, 2017

Middleton, who is set to marry Matthews on May 20 at St. Mark's Church in Englefield, England, made her first public appearance with her fiance at the event.

WATCH: Meghan Markle to Attend Pippa Middleton's Wedding With Prince Harry

A source told ET last week that in addition to hair treatments at her favorite salon, Richard Ward, Middleton has been preparing for her wedding with extra time in the gym.

"Pippa has been stepping up her workouts getting ready for her wedding," the source revealed. "She's been working out about four or five times a week."

"She's been working with a personal trainer at a gym near her home in Chelsea and also has been doing Pilates," the source continued. "She looks and feels great -- she's never looked better."

See more in the video above.

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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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