Kate Middleton's brother, James Middelton, makes new girlfriend Instagram official: Photo!

James Middleton has made it Instagram official with his girlfriend!

About a year after Kate Middleton's younger brother started dating French financial analyst Alizee Thevenet, he took to social media to share a photo of himself with the blonde beauty for the first time.

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Sail away with me ⛵️ ☀️

A post shared by James Middleton (@jmidy) on

"Sail away with me," he captioned a sun-filled shot of them smiling on a boat while wearing matching sweaters. He's also wearing a hat with her first initial, "A," on it.

SEE ALSO: Who is James Middleton's new girlfriend? Here's what we know

The 32-year-old Middleton reportedly started dating Thevenet early last summer after meeting at a bar, and they were first photographed together in December. Oner month later, photographs of the couple on the beach went viral during their family vacation with the Middletons in St. Barts.

11 PHOTOS
James Middleton out and about
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James Middleton out and about
LONDON, ENGLAND - DECEMBER 04: James Middleton seen attending The Henry van Straubenzee Memorial Fund's Christmas Carol Service at St Luke's Church on December 04, 2018 in London, England. (Photo by Ricky Vigil/GC Images)
BERLIN, GERMANY - NOVEMBER 08: James Middleton arrives for the 20th GQ Men of the Year Award at Komische Oper on November 8, 2018 in Berlin, Germany. (Photo by Sebastian Reuter/Getty Images for GQ Germany)
James Middleton arrives at the Lindo Wing of St Mary's Hospital, London, where his sister Pippa Middleton gave birth to a baby boy on Monday afternoon. (Photo by Nick Ansell/PA Images via Getty Images)
WINDSOR, UNITED KINGDOM - OCTOBER 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) James Middleton attends the wedding of Princess Eugenie of York and Jack Brooksbank at St George's Chapel on October 12, 2018 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)
Philippa Matthews (Middleton) (C), James Middleton (CR), the siblings of Britain's Catherine, Duchess of Cambridge, and Pippa's husband James Matthews (CL) arrive to attend the wedding of Britain's Princess Eugenie of York to Jack Brooksbank at St George's Chapel, Windsor Castle, in Windsor, on October 12, 2018. (Photo by Adrian DENNIS / various sources / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
LONDON, ENGLAND - JULY 11: Pippa Middleton and James Middleton attend day nine of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 11, 2018 in London, England. (Photo by Karwai Tang/WireImage )
Pippa Matthews and James Middleton applaud Kyle Edmund after his win on centre court on day four of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. (Photo by John Walton/PA Images via Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) James Middleton attends the wedding of Prince Harry to Ms Meghan Markle at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland. (Photo by Pool/Max Mumby/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) James Middleton, Pippa Middleton and James Matthews attend the wedding of Prince Harry to Ms Meghan Markle at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - OCTOBER 05: James Middleton attends the launch of Bazaar Art, published in association with Bentley, Mark's Club on October 5, 2017 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images)
LONDON, ENGLAND - JULY 16: Pippa Middleton & James Middleton seen arriving for day thirteen at The Championships at Wimbledon on July 16, 2017 in London, England. (Photo by HGL/GC Images)
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Thevenet's father, Jean-Gabriel Thevenet, spoke to the Daily Mail about his daughter's exciting new romance, and confirmed that "they are very much in love" with one another.

"My daughter Alizee is very happy with James," he added. "James is a very charming man. I am very happy that Alizee is together with James. I know she is very happy. We keep our fingers crossed for them. I am not to say how they met, to give away their secrets. You must talk to her or James, they will be back in London soon, but I’m very happy for them."

Middleton's romance follows a tumultuous five-year relationship with "Dancing on Ice" star Donna Air came to an end in February of last year.

James Middleton is the youngest of Michael and Carole Middleton's three children. He has two older sisters, Kate, 37, and Pippa, 35. Kate, of course, married Prince William back in 2011, while Pippa married James Matthews in 2017.

21 PHOTOS
Pippa Middleton and James Matthews together
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Pippa Middleton and James Matthews together
Pippa Matthews, center, James Matthews, center left, and James Middleton, second right, arrive to attend the wedding of Princess Eugenie of York and Jack Brooksbank at St George’s Chapel, Windsor Castle, near London, England, Friday Oct. 12, 2018. (Adrian Dennis, Pool via AP)
WINDSOR, ENGLAND - OCTOBER 12: James Matthews and Pippa Middleton attend the wedding of Princess Eugenie of York and Jack Brooksbank at St George's Chapel in Windsor Castle on October 12, 2018 in Windsor, England. (Photo by Pool/Samir Hussein/WireImage)
Pippa Middleton and her husband James Matthews arrive for the christening service of Prince Louis at the Chapel Royal, St James's Palace, London, Monday, July 9, 2018. (Dominic Lipinski/Pool Photo via AP)
Photo by: KGC-520/STAR MAX/IPx 2018 7/13/18 Pippa Middleton and James Matthews arrive at The All England tennis club in Wimbledon for the Mens Semi Final.
PARIS, FRANCE - MAY 27: Pippa Middleton and her husband James Matthews are seen at the French Open at Roland Garros on May 27, 2018 in Paris, France. (Photo by Bertrand Rindoff Petroff/Pierre Suu/Getty Images)
Pippa Matthews and James Middleton sit in the Royal Box on Centre Court on the fourth day of the Wimbledon Tennis Championships in London, Thursday July 5, 2018. (AP Photo/Tim Ireland)
LONDON, ENGLAND - JULY 14: Pippa Middleton & James Matthews seen at Day 11 of Wimbledon 2017 on July 14, 2017 in London, England. (Photo by HGL/GC Images)
LONDON, ENGLAND - JULY 14: Pippa Middleton and James Matthews attend day eleven of the Wimbledon Tennis Championships at the All England Lawn Tennis and Croquet Club on July 14, 2017 in London, United Kingdom. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JUNE 27: Pippa Middleton (L) and James Matthews attend The Miles Frost Fund party at Bunga Bunga Covent Garden on June 27, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)
LONDON, ENGLAND - JUNE 27: Pippa Middleton (L) and James Matthews attend The Miles Frost Fund party at Bunga Bunga Covent Garden on June 27, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)
Pippa Middleton (L) and her husband James Matthews (R) arrive at Rose Bay Wharf by sea plane in Sydney on May 31, 2017. Pippa and Matthews, who married on May 20, 2017, are visiting Sydney on their honeymoon. / AFP PHOTO / SAEED KHAN (Photo credit should read SAEED KHAN/AFP/Getty Images)
JUNE 1, 2017: DARWIN, NT - (EUROPE AND AUSTRALASIA OUT) Newly married James Matthews and Pippa Middleton arrive into Darwin International Airport in Darwin, Northern Territory. (Photo by Glenn Campbell/Newspix/Getty Images)
ENGLEFIELD GREEN, UNITED KINGDOM - MAY 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) James Matthews and Pippa Middleton leave St Mark's Church after their wedding on May 20, 2017 in Englefield Green, England. (Photo by Max Mumby/Indigo/Getty Images)
ENGLEFIELD GREEN, UNITED KINGDOM - MAY 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) James Matthews and Pippa Middleton leave St Mark's Church after their wedding on May 20, 2017 in Englefield Green, England. (Photo by Max Mumby/Indigo/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton and James Matthews leave after getting married at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Pool/Samir Hussein/WireImage)
ENGLEFIELD GREEN, UNITED KINGDOM - MAY 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) James Matthews and Pippa Middleton leave St Mark's Church after their wedding on May 20, 2017 in Englefield Green, England. (Photo by Max Mumby/Indigo/Getty Images)
BUCKLEBURY, BERKSHIRE - DECEMBER 25: Pippa Middleton and James Matthews attend church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 06: Pippa Middleton and James Matthews attend day nine of the Wimbledon Tennis Championships at Wimbledon on July 06, 2016 in London, England. (Photo by Karwai Tang/WireImage)
Photo by: KGC-520/STAR MAX/IPx 2018 7/11/18 Pippa Middleton and her brother James Middleton arrive at Wimbledon for the tennis this afternoon.
Pippa and James Matthews in the stands on centre court on day eleven of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. (Photo by Steven Paston/PA Images via Getty Images)
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