Khloe Kardashian is known to post inspirational messages on her social networking accounts. Her Twitter and Instagram accounts likewise served as her soundboards when she was encountering marital woes with Lamar Odom.

This is why Kim Kardashian was questioned when she announced on Twitter that quote-sharing people have "major issues." She immediately assured her followers that her post wasn't about her younger sister.

"I would never throw shade to my sissy on Twitter," she wrote. Khloe, however, reportedly felt like the mother of one wasn't telling the truth.

"Khloé's not stupid. She believes that Kim was aiming comments about Instagram posts at her, because they've spoken about it before," claimed one source to Star magazine.

Reports previously circulated that Kim felt like being outshined by her sister: "Kim is used to being the Kardashian sister everyone knows and adores, so she's feeling like Khloé is dethroning her."

Life and Style's source reports that Kim's "massive ego is to blame" why she isn't on speaking terms with her sister: "Khloe fees like lately the whole world ha to revolve around Kim and she's sick of it."

The publication's insider likewise claims that Kim was displeased when her younger sister bonded with Paris Hilton last October 10 in Dubai. Paris and Kim's friendship fell apart several years ago.

"Their relationship might not make it. They're at an all-time low- and right now, the problems between Kim and Khloe really don't seem fixable," added the source.