Credit: Chris Weeks/

When Kim Kardashian picked up the latest issue of Star — "Kardashians at War!" the cover screamed — she said she "laughed out loud."

"Cat fights? Jealous fits? Trash talk? If my sisters and I have cat fights, they are 100% playful, sisterly fights!!" she blogged Thursday. "You've seen how we tease each other on the show, and how we joke around on Twitter... it's what sisters do!!! There's no war here, people! We all totally support each other in anything and everything we do. Plus a little competition never hurt anyone ;)"

The 28-year-old reality star - who joined sister Khloe, 25, and new beau Lamar Odom at a Los Angeles movie premiere Wednesday night - said she and her sibs "drive each other to do better." She added that she and Khloe "motivated each other to lose weight, work out and generally be healthy."

Said Kim, "I am so grateful to have my sisters around me and I know we'll always support each other no matter what!"