Mariah Carey would've been due $50 million from James Packer if they had signed a pre-nuptial agreement and married.

Mariah Carey

Mariah Carey

According to gossip website TMZ, the former engaged couple - who split last month - had outlined a draft pre-nup in February, ahead of a planned March 1st wedding in Bora Bora, for which the superstar singer already had her dress and flowers arranged.

The flights for guests to their wedding were also booked but James' lawyers are said to have told him they couldn't get the agreement signed by March 1st.

In an email, he is alleged to have responded: "I don't know who's working for who because there are a lot of names I haven't heard before on this email chain. The people who work for me -- message -- do as I say or f*** off. I want to get married on March 1st. James."

His lawyers sent Mariah's team a 100-page document detailing the specifics of the draft pre-nup, which was never signed.

One of the reported clauses was that Mariah would have to return any jewellery given to her by the Australian billionaire if they split - unless he had gifted it to her with a signed note stating it was a present.

The document is also said to have stated the 46-year-old singer would be entitled to $50 million, the amount she is said to be after following their break up.

Despite their March 1st wedding plans, the pair wouldn't have been able to marry officially anyway as Mariah was still legally married to Nick Cannon.

The pair's divorce was finalised this week but they are determined to remain friends for the sake of their kids, five-year-old twins Moroccan and Monroe.

Mariah requested to legally dissolve their six-year marriage in January 2015, 20 weeks after their split.