The 31-year-old socialite is desperate to shed the extra weight she has gained since meeting West and has also resorted to a gruelling exercise routine, reported Contactmusic.
"How is it that Kourtney and I have the same amount of weight to lose but she just had a baby! SMH help! LOL (sic). Since I started QuickTrim again a few weeks ago, I'm down 6 lbs!!! Yay best feeling. I was getting discouraged but now I'm so motivated!," she tweeted.
The curvy model has previously said that her comfortable relationship with the rapper has affected her body shape and left her feeling overweight.
"I'm hoping to slim down a little bit, and I'm not afraid to say it. I think everyone goes up and down in whatever that comfortable love relationship phase is where you like to eat out, but now it's time to get it together again."