Kim Kardashian West parts ways with longtime assistant, source says they 'remain friends'

Kim Kardashian West is saying farewell to her longtime assistant, Stephanie Shepherd, a source tells ET.

“Stephanie was promoted from assistant to COO this year, but they both quickly realized that the new role and responsibilities were not the right fit for Stephanie to take on,” the source says. “Kim and Stephanie made the decision to part ways amicably and remain friends.”

Shepherd has spent some time with Kardashian since they professionally parted ways.

“She was most recently at Kim’s birthday dinner, which was attended by 20 of her closest friends and family,” the source added.

See photos of Stephanie Shepherd with Kim Kardashian:

12 PHOTOS
Kim Kardashian and Stephanie Shepherd together
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Kim Kardashian and Stephanie Shepherd together
LOS ANGELES, CA - JUNE 20: Kim Kardashian West and Stephanie Sheppard celebrate The Launch Of KKW Beauty on June 20, 2017 in Los Angeles, California. (Photo by Stefanie Keenan/Getty Images for Full Picture)
NEW YORK, NY - SEPTEMBER 08: Kim Kardashian on September 8, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK - JULY 11: Kim Kardashian seen leaving a photoshoot in Gramercy Park on July 11, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - JULY 10: Kim Kardashian seen out and about in Manhattan on July 10, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JUNE 14: Kim Kardashian seen on the streets of Manhattan on June 14, 2017 in New York City. (Photo by James Devaney/GC Images)
LAS VEGAS, NEVADA - APRIL 09: Ariel Tejada, Cesar Ramirez, Lauren Bennett, Stephanie Shepherd, Malika Haqq, Simon Huck and Mike Snedegar attend Hakkasan Las Vegas third anniversary at Hakkasan at MGM Grand on April 8, 2016 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
reality.
please by all means take your time while i try and get out of the car
happy birthday khlo $$ i love you madly
taking a pic with my fans
the dramz of the dubai trip tho #KUWTK
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RELATED: Kim Kardashian Ranks Her Family From Best to Worst Dressed

ET has reached out to Kardashian's rep for comment.

Meanwhile, Kardashian is preparing for baby number 3 via a surrogate. In an exclusive interview with ET, she opened up about her surrogacy experience so far, and confessed that it has been difficult at times. 

RELATED: Kim Kardashian Explains Why She Didn't Invite Her Surrogate to Baby Shower

"You know, it is really different," she confided. "Anyone that says or thinks it is just the easy way out is just completely wrong. I think it is so much harder to go through it this way, because you are not really in control. And, you know, obviously you pick someone that you completely trust and that you have a good bond and relationship with, but it is still ... knowing that I was able to carry my first two babies and not, you know, my baby now, it's hard for me. So, it's definitely a harder experience than I anticipated just in the control area."

Reporting by Brendon Geoffrion.

51 PHOTOS
Kim Kardashian out and about in 2017
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Kim Kardashian out and about in 2017
NEW YORK - AUGUST 01: Kim Kardashian and Kendall Jenner shop East Village thrift stores with their 2 bodyguards as Kim displays her chest in a see through tank top with army fatigue shorts on August 01, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - AUGUST 01: (EDITORS NOTE: Image contains nudity) Kim Kardashian and model Kendall Jenner are seen walking in Soho on August 1, 2017 in New York City. (Photo by Raymond Hall/GC Images)

Kim Kardashian West attends The Tot holiday pop-up celebration at Laduree at the Grove on December 4, 2017 in Los Angeles, California.

(Photo by Donato Sardella/Getty Images for The Tot)

NEW YORK, NY - SEPTEMBER 08: Kim Kardashian West is seen leaving The Plaza Hotel on September 8, 2017 in New York City. (Photo by Gilbert Carrasquillo/GC Images)
MALIBU, CA - NOVEMBER 15: Kim Kardashian attends Bumble Bizz Los Angeles Launch Dinner At Nobu Malibu at Nobu Malibu on November 15, 2017 in Malibu, California. (Photo by Charley Gallay/Getty Images for Bumble)
LOS ANGELES - NOVEMBER 15: Kim Kardashian West greets the audience during 'The Late Late Show with James Corden,' Wednesday, November 15, 2017 (12:35 PM-1:37 AM ET/PT) On The CBS Television Network. (Photo by Terence Patrick/CBS via Getty Images)
LOS ANGELES, CA - NOVEMBER 17: Kim Kardashian is seen on November 17, 2017 in Los Angeles, CA. (Photo by Hollywood To You/Star Max/GC Images)
LOS ANGELES, CA - NOVEMBER 04: Kim Kardashian attends the 2017 LACMA Art + Film Gala Honoring Mark Bradford and George Lucas presented by Gucci at LACMA on November 4, 2017 in Los Angeles, California. (Photo by JB Lacroix/ WireImage)
LOS ANGELES, CA - NOVEMBER 04: Kim Kardashian arrives at the 2017 LACMA Art + Film Gala honoring Mark Bradford and George Lucas at LACMA on November 4, 2017 in Los Angeles, California. (Photo by Gregg DeGuire/WireImage)
JIMMY KIMMEL LIVE - ABC's 'Jimmy Kimmel Live' features a week of guest hosts filling in for Jimmy, starting Monday, October 30. The guest host for Thursday, November 2 was Jennifer Lawrence with guest Kim Kardashian West (KKW Beauty) and musical guest Linkin Bridge. (Randy Holmes/ABC via Getty Images) KIM KARDASHIAN
JIMMY KIMMEL LIVE - ABC's 'Jimmy Kimmel Live' features a week of guest hosts filling in for Jimmy, starting Monday, October 30. The guest host for Thursday, November 2 was Jennifer Lawrence with guest Kim Kardashian West (KKW Beauty) and musical guest Linkin Bridge. (Randy Holmes/ABC via Getty Images) KIM KARDASHIAN, JENNIFER LAWRENCE
LOS ANGELES, CA - NOVEMBER 02: Kim Kardashian is seen at 'Jimmy Kimmel Live' on November 02, 2017 in Los Angeles, California. (Photo by BG017/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 27: Kim Kardashian (L) and Jonathan Cheban attend Casamigos Halloween Party on October 27, 2017 in Los Angeles, California. (Photo by Neilson Barnard/Getty Images for Casamigos Tequila)
LOS ANGELES, CA - OCTOBER 14: In this handout photo provided by One Voice: Somos Live!, Jennifer Lopez (L) and Kim Kardashian participate in the phone bank onstage during 'One Voice: Somos Live! A Concert For Disaster Relief' at the Universal Studios Lot on October 14, 2017 in Los Angeles, California. (Photo by Kevin Mazur/One Voice: Somos Live!/Getty Images)
NEW YORK, NY - SEPTEMBER 09: Kim Kardashian arrives at the Alexander Wang show during NYFW on September 9, 2017 in New York City. (Photo by Pierre Suu/GC Images)
NEW YORK, NY - SEPTEMBER 09: Kim Kardashian seen on September 9, 2017 in New York City. (Photo by Team GT/GC Images)
Kim Kardashian attends Harper's BAZAAR Celebration of 'ICONS By Carine Roitfeld' at The Plaza Hotel presented by Infor, Laura Mercier, Stella Artois, FUJIFILM and SWAROVSKI on September 8, 2017 in New York City. / AFP PHOTO / ANGELA WEISS (Photo credit should read ANGELA WEISS/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 08: Kim Kardashian on September 8, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - SEPTEMBER 07: Kim Kardashian seen on the streets of Manhattan on September 7, 2017 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - SEPTEMBER 06: Kim Kardashian West is seen on September 6, 2017 in New York City. (Photo by Marc Piasecki/GC Images)
NEW YORK, NY - SEPTEMBER 06: Kim Kardashian attends the Tom Ford Spring/Summer 2018 Runway Show at Park Avenue Armory on September 6, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Tom Ford)
NEW YORK, NY - AUGUST 02: Kim Kardashian is seen walking in Soho on August 2, 2017 in New York City. (Photo by Raymond Hall/GC Images)
BEVERLY HILLS, CA - JULY 20: Kim Kardashian at BALMAIN celebrates first Los Angeles boutique opening and Beats by Dre collaboration on July 20, 2017 in Beverly Hills, California. (Photo by Donato Sardella/Getty Images for BLAMAIN)
BEVERLY HILLS, CA - JULY 20: Kim Kardashian at BALMAIN celebrates first Los Angeles boutique opening and Beats by Dre collaboration on July 20, 2017 in Beverly Hills, California. (Photo by Stefanie Keenan/Getty Images for BALMAIN)
NEW YORK - JULY 11: Kim Kardashian seen leaving a photoshoot in Gramercy Park on July 11, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - JULY 11: Kim Kardashian seen leaving a photoshoot in Gramercy Park on July 11, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK - JULY 10: Kim Kardashian gets dinner at Estiatorio Milos in Mid Town Manhattan on July 10, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
LOS ANGELES, CA - JUNE 20: Kim Kardashian West celebrates The Launch Of KKW Beauty on June 20, 2017 in Los Angeles, California. (Photo by Stefanie Keenan/Getty Images for Full Picture)
NEW YORK - JUNE 14: Kim Kardashian seen leaving her apartment in Soho on June 14, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - JUNE 13: Kim Kardashian is seen walking in Soho on June 13, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JUNE 13: Kim Kardashian and a friend seen out in Manhattan on June 13, 2017 in New York City. (Photo by Robert Kamau/GC Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Episode 14097 -- Pictured: Kim Kardashian -- (Photo by: Chris Haston/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MAY 15: TV personality Kim Kardashian attends the 2017 NBCUniversal Upfront at Radio City Music Hall on May 15, 2017 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - MAY 15: TV personality Kim Kardashian is seen in SoHo on May 15, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - MAY 01: Kim Kardashian attends 'Rei Kawakubo/Comme des Gar�ns:Art of the In-Between' Costume Institute Gala at Metropolitan Museum of Art on May 1, 2017 in New York City. (Photo by Jackson Lee/FilmMagic)
HOLLYWOOD, CA - APRIL 12: Kim Kardashian arrives to the Los Angeles premiere of 'The Promise' at TCL Chinese Theatre on April 12, 2017 in Hollywood, California. (Photo by Tara Ziemba/Getty Images)
WEST HOLLYWOOD, CA - APRIL 02: Kim Kardashian arrives at the Daily Front Row's 3rd Annual Fashion Los Angeles Awards on April 2, 2017 in West Hollywood, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - MARCH 02: Kim Kardashian is seen on March 2, 2017 in Los Angeles, CA. (Photo by Hollywood To You/Star Max/GC Images)
NEW YORK, NY - FEBRUARY 16: Kim Kardashian is seen walking in Midtown on February 16, 2017 in New York City. (Photo by Raymond Hall/GC Images)
BEVERLY HILLS, CA - MARCH 11: Television personality Kim Kardashian speaks onstage at the Family Equality Council's Impact Awards at the Beverly Wilshire Hotel on March 11, 2017 in Beverly Hills, California. (Photo by Rich Polk/Getty Images for Family Equality Council )
NEW YORK, NY - FEBRUARY 15: Kim Kardashian is seen on February 15, 2017 in New York City. (Photo by Marc Piasecki/GC Images)
NEW YORK - FEBRUARY 14: Kim Kardashian gets lunch at the Mercer Kitchen on February 14, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - FEBRUARY 14: Kim Kardashian is seen Soho on February 14, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - FEBRUARY 14: Kanye West and wife Kim Kardashian West are seen on February 14, 2017 in New York City. (Photo by Marc Piasecki/GC Images)
NEW YORK, NY - FEBRUARY 14: Kim Kardashian arrives at an hotel on February 14, 2017 in New York City. (Photo by Pierre Suu/GC Images)
NEW YORK, NY - FEBRUARY 13: Kim Kardashian and La La Anthony seen out in Manhattan on February 13, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - FEBRUARY 01: (L to R) Saint West, television personality Kim Kardashian West, and North West leave their Midtown Manhattan hotel on February 1, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JANUARY 17: Kim Kardashian is seen walking in Midtown on January 17, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK - JANUARY 16: Kim Kardashian seen leaving her hotel enrought to the Set of 'Oceans 8' filming a Met Gala Scene at the 'The Met' on January 16, 2017 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
LOS ANGELES, CA - JANUARY 11: Kim Kardashian and Scott Disick are seen at LAX on January 11, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
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