No ring, no bring! Pippa Middleton reportedly banning brother-in-law's new girlfriend from attending her wedding

Pippa Middleton is set to tie the knot with James Matthews in six weeks -- and the guest list is pretty iron clad.

The Duchess of Cambridge's sister, 33, is reportedly banning her soon-to-be husband's brother, "Made in Chelsea" star Spencer Matthews, from bringing his new girlfriend Vogue Williams in light of her "no ring, no bring" policy.

Vogue, a model and TV personality, confirmed her relationship with the reality star on British talk show "Lorraine" last month.

"Pippa's view is that Vogue's relationship with Spencer is still very new. It wouldn't be appropriate for her to be there after just a few months of dating," a source told The Sun. "But some people in the circle are pretty shocked because this is her future brother-in-law who's going to end up attending on his own. It's certainly raised eyebrows."

73 PHOTOS
Pippa Middleton Style
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Pippa Middleton Style
July 2007
Pippa looked breezy in a lilac wrap dress while out in London.
November 2007
Pippa attended a book launch in a pretty black dress with lce sleeves.
June 2008
Pippa attended Sotheby's Summer Party in a bright summery dress.
July 2008
Pippa wore this black and white belted dress to a book launch party.
September 2008
Middleton looked beautiful in a beaded gown at a charity gala in London.
September 2008
Pippa wore an Issa dress to the label's show at London Fashion Week.
September 2008
The socialite attended the Day-Glo Midnight Roller Disco alongside her sister, Kate, wearing a sequined mini.
September 2008
Pippa attended the End of Summer Ball in a flowing v-neck gown.
November 2008
Pippa chose this bright blue frock for the 10th Anniversary celebration of Claridge's Bar.
June 2009
Pippa wore this stunning white wrap dress to a polo match with white wedges.
October 2009
Kate's younger sister wore a tiered yellow dress to Tatler's 300th Anniversary Party.
December 2009
Pippa added a pop of red to her simple black dress with a bold belt.
May 2010
Pippa attended a fundraiser in a metallic-embellished dress.
February 2011
Pippa wore a black tiered jacket and bright pink fascinator to a friend's wedding.
April 2011
The day before Kate's wedding, the family arrived together.  Kate wore a patterned Issa dress while her sister was pretty in pink.
April 2011
Pippa was dressed in an Alexander McQueen gown for her sister Kate Middleton's wedding to Prince William.
April 2011
The morning after the Royal Wedding, the Middleton clan left their hotel.  Pippa was spotted in bright white pants and a blue Zara blazer.
May 2011
Pippa accessorized her all-denim look with a neutral bag.
May 2011
The Duchess' younger sister stepped out carrying her favorite Modalu bag, wearing jeans and a bright pink top.
June 2011
Pippa chose a blush colored Maje top and carried her Modalu bag while out in London.
June 2011
Pippa wore a crocheted white dress and a jean jacket to the AEGON Championships.
June 2011
Out for a shopping trip, Pippa chose a pretty blue and white wrap dress.
July 2011
Middleton attended a Wimbledon match in a navy version of her crocheted sweater dress.
July 2011
Pippa met up with friends wearing this casual denim dress by Whistles.
July 2011
Pippa wore this pretty two-tone Zara dress while out in London.
September 2011
Pippa dressed up a plaid Maje top with red flats and a Prada messenger bag.
September 2011
Middleton wore Temperley London's classic fan dress during London Fashion Week.
September 2011
Pippa stunned in London wearing a tiered silk dress by French Connection with a tan Whistles jacket.
September 2011
Pippa got coffee with friends in a white Issa dress, adding a pop of color with her Prada bag and matching red flats.
October 2011
Pippa glowed at the Boodles Boxing Ball in a red gown by Temperley.
October 2011
The Duchess' younger sister looked pretty in plaid by Zara and black skinny jeans.
October 2011
Pippa looked chic in a longsleeved LBD, an Alice by Temperley animal-print scarf and a Prada bag.
October 2011
Pippa attended a charity event in a stunning floral gown by Project D.
October 2011
Pippa wore a cobalt blue turtleneck dress with a chic black blazer and lace-up booties.
November 2011
The socialite bundled up in a funnel-neck grey Fay coat and black boots.
November 2011
We're slightly obsessed with Pippa's blue Sara Berman coat with suede trim which she wore with a black dress and booties.
November 2011
While out in London, Pippa wore a chic army green Fay coat with black skinny pants and a bag by Loewe.
November 2011
The royal-in-law wore a snowy white coat with black boots and gloves.
January 2012
Pippa went for a stroll in bright pink jeans by SuperDry, a plaid Maje top and Zara blazer.
Pippa wore a navy Orla Kiely jacket as she and brother James Middleton smile for the camera.
June 2012
Pippa attended a Wimbledon match in a navy dress and macramé jacket by Orla Kiely.
August 2012
Pippa wore this and white Alice Temperley dress to the premiere of Shadow Dancer, completing the look with strappy heels.
September 2012
Pippa wore a bright colorblocked Paper London dress to the U.S. Open.
September 2012
Our favorite royal-in-law went out shopping in NYC carrying a Kate Spade bag, and wearing a casual but bright outfit.
September 2012
Pippa attended the U.S. Open in a bright yellow Phase Eight frock.
October 2012
Pippa wore Stella McCartney to promote her book Celebrate: A Year of Festivities for Families and Friends.
October 2012
Pippa hosted a Halloween Party for children in London while promoting her book, wearing a brocade Markus Lupfer dress.
November 2012
She attended a party for W&W Jewellery, a British jewelry company in a metallic skirt and neutral top.
November 2012
Pippa traveled in style weraing a pretty eggplant coat.
December 2012
Pippa promoted her book Celebrate in Amsterdam wearing a bright purple peplum dress by Beulah London.
March 2013
Pippa looked cozy at the Cheltenham Festival in a Katherine Hooker mustard yellow coat and the same Aquatalia boots her sister Kate loves.
April 2013
As the new ambassador for the Mary Hare School for the Deaf, Pippa opened the "Murray House" in head-to-toe Tory Burch.
May 2013
Kate's sister stepped out in London wearing a top and skirt by Sandro, jacket by Alice by Temperley, Alice + Olivia heels, and the Catherine Street Pippa bag by Kate Spade New York.
May 2013
Pippa attended a party in a pink floral dress by Tabitha Webb.
May 2013
The middle-Middleton was out and about in silk ikat pants by Alice by Temperley.
May 2013
Pippa out and about with boyfriend Nico in London, wearing a chic black dress.
June 2013
Pippa wore a pretty green sweater dress and matching cardigan at the AEGON Championships with her mother Carole.
June 2013
Attending a friend's wedding, Pippa looked lovely in a black and white peplum Tabitha Webb dress and Olivia Roat Millinery fascinator.
June 2013
Pippa looked chic in a powder blue blazer over a matching dress at Wimbledon.
July 2013
Pippa attended Spectator Magazine's summer party in a pretty white lace dress.
July 2013
Pippa went to another game at Wimbledon with boyfriend Nico, wearing a striped coral dress by Temperley London.
July 2013
Leaving Andy Murray's match, Pippa looked vibrant in the coral dress.
July 2013
Pippa attended the Queen's Coronation ceremony in a floral Tabitha Webb dress with a lace overlay, and carried a clutch by Lamb 1887. 
September 2013
Pippa attends the wedding of James Meade and Lady Laura Marsham.
September 2013
Pippa and Nico Jackson pose at the Boodles Boxing Ball 2013 on September 21, 2013 at the Grosvenor House in London,England. 
September 2013
Pippa attends a donors dinner hosted by Michael Bloomberg & Graydon Carter to celebrate the launch of the new Serpentine Sackler Gallery.
October 2013
Pippa and James Middleton arrive at Chapel Royal in St James's Palace in central London to attend the christening of Prince George of Cambridge.
November 2013
Pippa and boyfriend Nico Jackson attend the Sugarplum Ball.
March 2014
Pippa attends a memorial service for Sir David Frost at Westminster Abbey.
June 2014
Pippa attends day two of the Aegon Championships at Queens Club.
June 2014
Pippa Middleton seen arriving at Wimbledon.
September 2014
Pippa attends the GQ Men of the Year awards.
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It sounds like Pippa is pretty serious about her "no ring, no bring" policy as it also looks pretty unlikely that Prince Harry's girlfriend of almost a year, actress Meghan Markle, will be in attendance.

Royal observers expected Markle to be the exception to the rule. Besides what the beautiful bride is wearing on her wedding day, we're sure Meghan's attendance will also be another highly-talked-about topic.

"It's clear that Pippa doesn't want to be outshone by any TV babes on her big day," the insider revealed.

Meanwhile, details about Pippa and James' big day have remained under wraps.

Her sister, Princess Kate, was spotted leaving her London abode on Thursday following a bridal party summit. Kate kept it casual in black skinnies, a cozy white sweater and sneakers. The visit comes days after Kate and William dined with their future brother-in-law's family.

James popped the question in July 2016 less than a year after they started dating. He proposed with a massive sparkler estimated to cost between $198,000 to $237,000.

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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