Beyonce and Kim Kardashian
Jay Z and Beyonce did not attend Kim Kardashian and Kanye West's wedding in Florence, Italy on 24 May. Reuters

American reality television star Kim Kardashian and Beyoncé are reportedly not on good terms.

Although Jay Z and Kanye West are close friends, their wives do not appear to share the same chemistry.

Beyoncé and Jay Z were noticeably absent from Kardashian and West's wedding in Florence, Italy on 24 May, following rumours the groom had asked Jay-Z to be his best man.

According to a print report from the 30 June edition of In Touch Weekly magazine, Beyoncé and the 33-year-old are allegedly "at war" following her decision to opt out from the Keeping Up with the Kardashians star's lavish nuptials.

"Kim and Kanye fully expected [Beyoncé and Jay Z] to come to the wedding," a source close to the newlyweds told the magazine.

The couple felt both "embarrassed" and "angry" when Beyoncé and Jay Z skipped their big day, and went to the Hamptons instead.

"Kim and Kanye are beyond pissed. Now it's a full on feud," a insider said.

However, it was previously reported that the On The Run performers decided to skip the lavish bash as Kardashian's best friend designer Rachel Roy was also invited.

Last month, during the Met Gala afterparty at New York City's Standard Hotel, Jay Z's closeness with Roy provoked his sister-in-law, Solange Knowles, to fly into a rage. This apparently led Solange physically attacking Jay Z in an elevator at the hotel.

"They weren't sure about all of the media attention and it possibly being filmed for the show [KUWTK], but after the fight with Rachel at the Met, they decided to lay low," a source told Hollywood Life.

"Bey and Jay are working on their marriage," the source added.