Kim Kardashian affectionately calls Caitlyn Jenner a 'tomboy,' talks Rob and her 'twin soul' Kylie

Before you go, we thought you'd like these...
Before you go close icon
Kris Jenner Finally Breaks Silence on Caitlyn Jenner's Vanity Fair Cover

Kim Kardashian could not have a better relationship with Caitlyn Jenner.

ET caught up with the 34-year-old reality superstar at the DailyMail.com's yacht party in Cannes, France on Wednesday, where she dished about spending time with Caitlyn on Father's Day. Caitlyn tweeted a picture of their family celebration on Monday, which featured Kim and husband Kanye West holding their daughter, North West, as well as Khloe Kardashian and Kendall Jenner.

"I told her she's a tomboy because she really likes off-roading and doing all the things that she did before," Kim told ET with obvious affection for the 65-year-old Olympian. "So we had a really good time. It was family, and we just had a chill day."

PHOTOS: Kim Kardashian's Baby No. 2 Pregnancy Style

Speaking of family, Kim confirmed that she's in touch with her younger brother, 28-year-old Rob Kardashian, despite the two making it no secret that they haven't always had the best relationship. However, Rob -- who has largely stayed out of the spotlight in the last year -- did recently make nice with Kim on Twitter, by sending her a voice note to help with her nausea.

See Kim through the years:

48 PHOTOS
Kim Kardashian through the years
See Gallery
Kim Kardashian affectionately calls Caitlyn Jenner a 'tomboy,' talks Rob and her 'twin soul' Kylie
HOLLYWOOD - JULY 07: Kim Kardashian arrives at the Midsummer Night's Dream Celebrity Poker evening held at the Avalon club on July 7, 2006 in Hollywood, California (Photo by Frazer Harrison/Getty Images)
LOS ANGELES - AUGUST 18: Socialite Kim Kardashian (left) and actress/singer Paris Hilton arrive at Paris Hilton's debut cd release party at Privilege on August 18, 2006 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
HOLLYWOOD, CA - NOVEMBER 16: Kim Kardashian poses for a picture at the launch party for the Nintendo 'Wii' game console November 16, 2006 held at 'Boulevard 3' in Los Angeles, California. (Photo by Toby Canham/Getty Images)
LAS VEGAS - JUNE 16: Socialite Kim Kardashian arrives at the fourth anniversary party for Vegas Magazine on the closing night of the CineVegas film festival at the Mandalay Bay Resort & Casino June 16, 2007 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for CineVegas)
LOS ANGELES, CA - JUNE 21: Socialite Kim Kardashian poses at the OmniPeace Event to stop extreme poverty in Sub-Saharan Africa by 2025 at Kitson Men on June 21, 2007 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
MIAMI BEACH, FL - JULY 13: Socailite Kim Kardashian attends the Ashley Paige swimwear fashion show during 'Mercedes Benz Fashion Week: Miami Swim' in the Cabana Grande tent at the Raleigh Hotel on July 13, 2007 in Miami Beach. (Photo by Evan Agostini/Getty Images for Ashley Paige)
LOS ANGELES, CA - JULY 18: Socialite Kim Kardashian arrives at a party for the Chelsea Football Club at a private estate on July 18, 2007 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
LOS ANGELES - OCTOBER 25: TV personality Kim Kardashian arrives at the premiere of 'Somebody Help Me' at the Chinese Theatre on October 25, 2007 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
PARK CITY, UT - JANUARY 19: NFL player Reggie Bush (L) and TV personality Kim Kardashian on the street during the 2008 Sundance Film Festival on January 19, 2008 in Park City, Utah. (Photo by Scott Halleran/Getty Images)
HOLLYWOOD, CA. - MARCH 19: (L-R) Television personalities and sisters Kim Kardashian, Khloe Kardashian, and Kourtney Kardashian attend the season two launch of 'Keeping Up With The Kardashians' at Les Deux on March 19, 2008 in Hollywood, California. (Photo by Charley Gallay/Getty Images)
LOS ANGELES, CA - APRIL 07: Television personality Kim Kardashian celebrates the launch of the new fall Bongo collection at the Los Angeles Fashion Mart on April 7, 2008 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
MONTE CARLO, MONACO - JUNE 11: TV personality Kim Kardashian (C) with her mother Kris (L) and sister Kourtney attend a photocall promoting the television series 'Keeping Up With the Kardashians' on the fourth day of the 2008 Monte Carlo Television Festival held at Grimaldi Forum on June 11, 2008 in Monte Carlo, Principality of Monaco. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - AUGUST 27: Television personality Kim Kardashian arrives at the Launch Party for the New BlackBerry 8330 Pink Curve xxclusively from Verizon Wireless on the 15th Anniversary of Intermix on August 27, 2008 at Intermix on Robertson, Los Angeles, CA. (Photo by Frazer Harrison/Getty Images)
GUADALAJARA, MEXICO - OCTOBER 16: Television personality Kim Kardashian poses in the press room during the 7th Annual 'Los Premios MTV Latin America 2008' Awards held at the Auditorio Telmex on October 16, 2008 in Guadalajara, Mexico. (Photo by Gustavo Caballero/Getty Images)
NEW YORK - FEBRUARY 16: TV personality Kim Kardashian (right) and Reggie Bush of the New Orleans Saints pose backstage during Mercedes-Benz Fall 2009 Fashion Week at Bryant Park on February 16, 2009 in New York City. (Photo by Thos Robinson/Getty Images)
LOS ANGELES, CA - JUNE 22: TV personality Kim Kardashian arrives at the premiere of Dreamworks' 'Transformers: Revenge Of The Fallen' held at Mann Village Theatre on June 22, 2009 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK - SEPTEMBER 14: TV personality Kim Kardashian attends Jill Stuart Spring 2010 fashion show at The New York Public Library on September 14, 2009 in New York, New York. (Photo by Jason Kempin/Getty Images for IMG)
NEW YORK - FEBRUARY 11: TV personality Kim Kardashian backstage at the Heart Truth Fall 2010 Fashion Show during Mercedes-Benz Fashion Week at The Tent at Bryant Park on February 11, 2010 in New York City. (Photo by Jemal Countess/Getty Images for IMG)
NEW YORK - FEBRUARY 15: TV personality Kim Kardashian promotes the launch of her new 'Kim Kardashian' fragrance at Sephora on February 15, 2010 in New York City. (Photo by Michael Loccisano/Getty Images)
WASHINGTON - MAY 01: Kim Kardashian attends the White House Correspondents' Association dinner after party hosted by Niche Media and Capitol File magazine at The Mayflower Renaissance Washington DC Hotel on May 1, 2010 in Washington, DC. (Photo by Leigh Vogel/Getty Images)
LOS ANGELES, CA - JUNE 24: (L-R) Sisters Kourtney Kardashian, Kendall Jenner, Kim Kardashian, Kylie Jenner arrive at the premiere of Summit Entertainment's 'The Twilight Saga: Eclipse' during the 2010 Los Angeles Film Festival at Nokia Theatre L.A. Live on June 24, 2010 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
UNIVERSAL CITY, CA - AUGUST 08: TV personality Kim Kardashian arrives at the 2010 Teen Choice Awards at Gibson Amphitheatre on August 8, 2010 in Universal City, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - JANUARY 14: Kim Kardashian arrives at the 16th annual Critics' Choice Movie Awards at the Hollywood Palladium on January 14, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - FEBRUARY 25: Kim Kardashian (L) and Kourtney Kardashian (R) arrive at QVC Red Carpet Style Party on February 25, 2011 in Los Angeles, California. (Photo by Valerie Macon/Getty Images)
MONACO - MAY 27: Kim Kardashian (L) and Kris Humphries (R) arrive to attend the AmberLounge Fashion Monaco 2011 on May 27, 2011 in Monaco. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - AUGUST 28: TV Personality Kim Kardashian arrives at the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)
NEW YORK, NY - SEPTEMBER 13: TV personality Kim Kardashian poses backstage at the Vera Wang Spring 2012 fashion show during Mercedes-Benz Fashion Week at The Stage at Lincoln Center on September 13, 2011 in New York City. (Photo by Craig Barritt/Getty Images for Mercedes-Benz Fashion Week)
NEW YORK, NY - OCTOBER 17: Kim Kardashian attends the 2011 Angel Ball To Benefit Gabrielle's Angel Foundation at Cipriani Wall Street on October 17, 2011 in New York City. (Photo by Andrew H. Walker/Getty Images)
LOS ANGELES, CA - JANUARY 14: TV personality Kim Kardashian arrives at the Cinema For Peace event benefitting J/P Haitian Relief Organization in Los Angeles held at Montage Hotel on January 14, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images For J/P Haitian Relief Organization and Cinema For Peace)
LOS ANGELES, CA - FEBRUARY 26: TV personality Kim Kardashian arrives at the 20th Annual Elton John AIDS Foundation's Oscar Viewing Party held at West Hollywood Park on February 26, 2012 in West Hollywood, California. (Photo by Frederick M. Brown/Getty Images)
LONDON, ENGLAND - MAY 17: Kim Kardashian attends The FiFi UK Fragrance Awards 2012 at The Brewery on May 17, 2012 in London, England. (Photo by Ben Pruchnie/Getty Images)
LOS ANGELES, CA - JULY 01: (L-R) Television personality Kim Kardashian and rapper Kanye West attend the 2012 BET Awards at The Shrine Auditorium on July 1, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images For BET)
FRANKFURT AM MAIN, GERMANY - NOVEMBER 11: Kim Kardashian presents the award for Best Song onstage at the MTV EMA's 2012 at Festhalle Frankfurt on November 11, 2012 in Frankfurt am Main, Germany. (Photo by Andreas Rentz/Getty Images for MTV)
MELBOURNE, AUSTRALIA - SEPTEMBER 21: Kim Kardashian makes public appearance at Westfield Southland on September 21, 2012 in Melbourne, Australia. (Photo by Lucas Dawson/Getty Images)
LOS ANGELES, CA - FEBRUARY 24: Television Personalities Kourtney Kardashian and Kim Kardashian arrive at the 21st Annual Elton John AIDS Foundation's Oscar Viewing Party on February 24, 2013 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - MARCH 02: Television Personality Kim Kardashian attends DuJour magazine's Spring issue collaboration with Kim Kardashian and Bruce Weber at the Four Seasons Hotel Los Angeles at Beverly Hills on March 2, 2013 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
PARIS, FRANCE - SEPTEMBER 29: Kim Kardashian attends the Givenchy show as part of the Paris Fashion Week Womenswear Spring/Summer 2014 on September 29, 2013 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
NEW YORK, NY - MAY 06: Kim Kardashian (L) and Kanye West attend the Costume Institute Gala for the 'PUNK: Chaos to Couture' exhibition at the Metropolitan Museum of Art on May 6, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images for The Huffington Post)
NEW YORK, NY - MAY 05: [EDITOR'S NOTE: Image has been digitally processed] Kanye West and Kim Kardashian attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Andrew H. Walker/Getty Images)
LOS ANGELES, CA - AUGUST 06: Kim Kardashian celebrates summer with the Kardashian Sun Kissed line and fans at ULTA Beauty on August 6, 2014 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
NASHVILLE, TN - JUNE 02: Kim Kardashian West attends the Hype Energy Drinks U.S. Launch on June 2, 2015 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
PARIS, FRANCE - SEPTEMBER 28: (L-R) Kim Kardashian and baby North West attend the Givenchy show as part of the Paris Fashion Week Womenswear Spring/Summer 2015 on September 28, 2014 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
MELBOURNE, AUSTRALIA - NOVEMBER 18: Kim Kardashian arrives to promote her new fragrance 'Fleur Fatale' at a Spice Market event on November 18, 2014 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)
US reality TV star Kim Kardashian poses during a photocall to present her new cosmetic brand in Paris on April 15, 2015 . AFP PHOTO / LOIC VENANCE (Photo credit should read LOIC VENANCE/AFP/Getty Images)
Kim Kardashian West poses for pictures before launching her collection for Brazil's C&A brand on May 11, 2015 in Sao Paulo, Brazil. AFP PHOTO / MIGUEL SCHINCARIOL (Photo credit should read Miguel Schincariol/AFP/Getty Images)
Photo by: KGC-173/STAR MAX/IPx 7/22/15 Kim Kardashian is seen at LAX Airport. (CA)
Photo by: STRF/STAR MAX/IPx 7/16/15 Kim Kardashian is seen in Los Angeles, CA
of
SEE ALL
BACK TO SLIDE
SHOW CAPTION +
HIDE CAPTION

"He sends me funny voice notes all day long," she said with a smile. "He always has, it's his thing. So he was sending me funny ones last night of him singing, which had nothing to do with the tweet helping me with my nausea. I think he was just trying to make me feel better singing."

Despite reports on his alleged 100-pound weight gain in the last year alone and rumors of depression, Kim said Rob is currently in good spirits.

"He has been, and that always makes me happy," she shared.

As for another one of her famous siblings, Kim commented on the constant comparisons between her and her youngest sister, 17-year-old Kylie Jenner.

"I love that," she laughed. "She is the best, you know? She's my little twin soul. She's such a free spirit, and I love that. She's the sweetest."

PHOTOS: Kylie Takes a Cue from Kim Kardashian, Goes Nearly Naked in Sheer Dress

Check out the video below to hear Kylie dish to ET about her 18th birthday plans!

See the photos from Caitlyn Jenner's introduction to the world:

18 PHOTOS
Caitlyn Jenner is introduced to the world
See Gallery
Kim Kardashian affectionately calls Caitlyn Jenner a 'tomboy,' talks Rob and her 'twin soul' Kylie
In this June 1, 2015 photo, a journalist looks at Vanity Fair's Twitter site with the Tweet about Caitlyn Jenner, who will be featured on the July cover of the magazine. Caitlyn Jenner, the transgender Olympic champion formerly known as Bruce, on Monday unveiled her new name and look in a sexy Vanity Fair cover shoot -- drawing widespread praise, including from the White House. Lesbian, gay, bisexual and transgender campaigners -- and many well-wishers -- welcomed the high-profile debut, as did the 65-year-old Jenner's family, which includes the media-savvy celebrity Kardashian clan. 'I'm so happy after such a long struggle to be living my true self,' Jenner wrote in her first tweet after the magazine released the July cover photo by renowned photographer Annie Leibovitz. (Photo credit Mladen Antonov, AFP/Getty Images)
Great day yesterday for Father's Day. We had so much fun off-roading. So much love and support! Love my family!
The best thing about being a woman is the prerogative to have a little fun #Caitlyn #ServingCindyMcCainRealness #TransRepubsAreTheBestRepubs (dying for that old school glamour waist to breast ratio)
A photo editor views the July cover of Vanity Fair featuring Caitlyn Jenner on June 1, 2015 in Westwood, California. Formerly known as Bruce Jenner, Caitlyn Jenner is an Olympic atlete who came out publicly as transgender in a televised interview with Diane Sawyer. (Photo by Frazer Harrison/Getty Images)
Caitlyn Jenner poses for Annie Leibovitz on the cover of Vanity Fair #CallMeCaitlyn http://t.co/NRyh6R09RR http://t.co/GO1ZgJJKBR
SO gorgeous!!!! RT #BruceJenner's first photo as a woman revealed! Meet #CaitlynJenner HERE! http://t.co/eXq7FSK4Vl #CallMeCaitlyn
Finally free. This made me stop. The feeling of freedom. You go @Caitlyn_Jenner! https://t.co/P4nDwltjxi
#CallMeCaitlyn: Caitlyn Jenner was photographed by Annie Leibovitz for @VanityFair cover http://t.co/vKHoOCvBzO
BEAUTIFUL!!! #callmecaitlyn
CAITLYN!!!!!!!!!! Love this. So happy for her. https://t.co/YOo4kdBOJl
Caitlyn? But why isn't it Kaitlyn with a K? (Bravo, Ms. Jenner!)
Congratulations Caitlyn
❤️RT @VanityFair: I’m not doing this to be interesting. I’m doing this to live #CallMeCaitlyn http://t.co/Fkpu3xYYX5 http://t.co/cFKkBeQN4V
#CaitlynJenner has truly broken the Internet. What a moment.
❤️🔥🔥🔥🔥 YAS 🔥🔥🔥🔥❤️
Caitlyn Jenner for Vanity Fair 📷 Annie Leibovitz! How beautiful! Be happy, be proud, live life YOUR way!
now that's a cover.
of
SEE ALL
BACK TO SLIDE
SHOW CAPTION +
HIDE CAPTION
Read Full Story

From Our Partners