Beyonce, Jay Z, Kanye West and Kim Kardashian. Picture: Getty Images

Jay Z has reportedly turned down the chance to be Kanye West's best man despite their long-running bromance.

The rapper only agreed to the idea initially on the condition his family, including wife Beyonce and their two-year-old daughter Blue Ivy, wouldn't be filmed for the reality show of West's fiancee, Kim Kardashian.

"Jay is Kanye's closest friend so he wants him to be best man," an insider revealed to the Daily Star newspaper.

Beyonce is said to be totally against appearing on Keeping up with the Kardashians because the thought of popping up on the show "mortifies" her.

"She purposefully keeps herself away from trashy TV and isn't prepared to lower her standards for anyone, or any occasion," the source said.

However, executives at the network that airs the long-running reality series are reportedly very eager to air the ceremony, meaning Jay Z may miss out on being best man.

"Bosses at E! are desperate to get the nuptials on air, and will pay millions to make it happen," the insider added.

Meanwhile, Kardashian is set to receive US$1 million ($1.1 million) for every year she stays married to West with a cap at 10 years, according to their prenup.

A source told the hitmaker was not fussed about the details of the prenup - a stark contrast to the lengthy legal process that preceded Kardashian's marriage to basketball player Kris Humphries in 2011.

According to estimates, West is worth $100 million, while Kardashian has a personal fortune of about $40 million.

No custody arrangements for their eight-month-old daughter, North, are included in the prenuptial agreement.

The couple are said to be marrying in Paris on May 24.

The West Australian

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