Kanye West made headlines last week when he attacked Jay Z for his reaction to Kim Kardashian's robbery — but it turns out Beyoncé might be to blame.

A new report claims the feud began because the former Destiny's Child star, 35, "never genuinely liked" Kim, 36.

"She’s mostly tolerated her because of their husbands’ friendship and [their] mutual friends, like Jennifer Lopez. She is always a little icy to Kim. The last time they hung out, the minute Beyoncé could leave the conversation, she did. They always have lots of awkward pauses when they speak," a source told Page Six.

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The same insider also previously spilled that Hov, 46, thinks Kanye, 39, is a "nut job" and "can only tolerate him in small doses." Bey and Jay seemingly first made their stance in 2014 when they infamously skipped Kimye's wedding.

MORE: We Bet You Forgot These Celebs Appeared on 'Keeping Up With the Kardashians'

"[Beyoncé’s] behavior during the wedding proved she isn’t Kim’s biggest fan,” the source continued, adding they cannot stand when the father-of-two appears on Kim's family's E! reality series Keeping Up With the Kardashians.

“[She] always gives Kanye a lot of grief whenever he’s done anything for the show.”

We guess Blue Ivy won't be playing with North and Saint West anytime soon!

Check out all the times Bey tolerated Kim in the gallery!