Friendships are built on shared interests, passions and personality traits.

Also, initials.

That's one of the only explanations we can think of for the latest celebrity friendship between Karlie Kloss and Kim Kardashian. Kim posted a photo of herself and the model on Instagram on Monday with the simple caption "❤️ @karliekloss"

Karlie tweeted at Kim, "so good to see you the other night, you looked beautiful xx kk"

And thus a lovely friendship, full of monogrammed gifts and kutesy nicknames, was born. Think Kim will sit front row when Karlie's walking runways this coming Fashion Week?

Does she seem like Kim's kind of pal?

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  • John Galliano Fall 2011

    (AFP photo)

  • Carolina Herrera Fall 2011

    (WireImage photo)

  • Jean Paul Gaultier Fall 2011

    (AFP photo)

  • Christian Dior Fall 2011

    (AFP photo)

  • i-D, Spring 2011

  • Christian Dior Spring 2011 campaign

  • Allure Korea, April 2011

  • Met Gala, May 2011

    (FilmMagic photo)

  • Chanel Resort 2011

    (WireImage photo)

  • Chanel Resort 2011

    (WireImage photo)

  • CFDA Awards, June 2011

    (Getty photo)

  • QVC event, July 2011

    (Getty photo)

  • Elie Saab Couture Fall 2011

    (AFP photo)

  • Elie Saab Couture Fall 2011

    (AFP photo)

  • Christian Dior Couture Fall 2011

    (AFP photo)

  • Christian Dior Couture Fall 2011

    (AFP photo)

  • Armani Prive Couture Fall 2011

    (AFP photo)

  • Harper's Bazaar Australia, September 2011

  • amfAR MILANO, September 2011

    (Getty photo)

  • Celebrating Jason Wu, September 2011

    (WireImage photo)

  • LIFE, September 2011

  • LIFE, September 2011

    (Photo by Gabrielle Revere for LIFE)

  • The Sunday Times Style, September 2011

  • Bally Fall 2011 campaign

  • Elie Saab Spring 2012

    (Getty photo)

  • Elie Saab Spring 2012

    (Getty photo)

  • Rick Owens Spring 2012

    (AFP photo)

  • Christian Dior Spring 2012

    (Getty photo)

  • Roland Mouret Spring 2012

    (AFP photo)

  • Anthony Vaccarello Spring 2012

    (AFP photo)

  • Salvatore Ferragamo Spring 2012

    (AFP photo)

  • Gareth Pugh Spring 2012

    (AFP photo)

  • J. Mendel Spring 2012

    (AFP photo)

  • Jean Paul Gaultier Spring 2012

    (AFP photo)

  • Donna Karan Resort 2011 campaign

  • Victoria's Secret Fashion Show, November 2011

    (FilmMagic photo)

  • Victoria's Secret Fashion Show, November 2011

    (Getty photo)

  • Victoria's Secret Fashion Show, November 2011

    (WireImage photo)

  • Victoria's Secret Fashion Show, November 2011

  • Numero, December 2011

  • German Vogue, December 2011

  • Vogue Italia, December 2011

  • Vogue Italia, December 2011

    (Photo by Steven Meisel for Vogue Italia)

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