The film, which stars Jamie Dornan and Dakota Johnson in lead roles, is due in theatres on February 13.
Kardashian, 34, who attended the screening with a group of friends, raved about the film on Twitter, reported Us magazine.
"Girls night watching a private screening of Fifty Shades of Grey!! OMG it's sooooo good!!" she wrote.
Her sister Kendall Jenner, almost instantly, replied, "KimKardashian and no invite?!," a message Kardashian did not respond to.