Did Kourtney Kadashian ditched sister Kim? After "an amazing couple of days in Las Vegas," Kim and Kourtney headed back to New York City only to be welcomed by a reports that the two Kardashians are having a fight, yet again.

According to reports by In Touch (the same magazine that published Irma Nici's claim of tryst with David Beckham), Kourtney ditched Kim at latter's very own birthday party held in TAO.

Kourtney's absence has been played up by In Touch saying that Kim was abandoned by her sister because the two are currently at war.

Kim issued a denial on her blog, saying:

"In Touch magazine are saying that Kourtney and I are at war because she didn't attend my birthday party at Tao. Kourtney is a mother! She has more important things to take care of and she had to be home with Mason!"

"If she HAD been at the party all night with me, they probably would have reported that she should have been home with Mason and not out partying. How ridiculous is this story!?"

Kourtney is now residing in New York with husband Scott Disick. They have a son, Mason. Kim Kardashian moved to New York with the Kourtney's family where at present they are shooting a Keeping Up with the Kardashian spin off show set in the Big Apple.