The Keeping Up With The Kardashians star is said to have taken refuge in comfort food, after her husband Lamar Odom was rumoured to have blamed her for being put on the Dallas Mavericks' 'inactive' list.
However, Kardashian dropped a dress size after intense training with basketball player Odom, according to Life and Style Weekly.
A photograph of the 27-year-old socialite and businesswoman in a purple bikini appears on a new issue of the magazine under the heading: 'How I got thin fast!'.
Kardashian's quick weight loss has been credited to eating healthy meals cooked by a personal chef, as well as exercise classes with a personal trainer.
Eldest sister Kourtney told the same magazine that she had lost 33lb in pregnancy weight after giving birth to son Mason in December 2009.
She said at the time that her boyfriend Scott Disick "could tell I'm noticing [the difference], because I'll do these stupid dances in the mirror".