Divorces are often a messy business, but add a combined $2.1 billion and things get even shakier than before. It’s no secret that Kim Kardashian and Kanye West’s net worths are high. So how can they even begin to divide their assets?

According to BuzzFeed News, the couple agreed to joint custody over their children, North, 7, Saint, 5, Chicago, 3, and Psalm, 22 months, after months of speculation regarding what the two would decide to do with them. Despite Kim and Kanye’s “irreconcilable differences,” cited by Kim herself, as well as their differing visions on how to raise their four kids, Kim requested joint legal and physical custody of their children.

One huge question remains: What will they do with their mountain of dough?

US Weekly reported that Kanye West’s business, Yeezy, was bolstered by high-profile partnerships such as Adidas AG and Gap Inc., which brings the company’s valuation to between $3.2 and $4.7 billion. Kanye’s net worth has skyrocketed to $6.6 billion.

Kanye isn’t the only one with newfound worth. Kim Kardashian recently reached the billionaire milestone according to Forbes. KKW Beauty and her popular shapewear firm Skims, along with other assets, combine to make her worth over a billion dollars.

Forbes also reported that Kim and Kanye signed a prenuptial agreement, which will simplify the eventual dividing of their wealth. Both of their businesses are independently run, Kim Kardashian with her KKW Beauty and Kanye West with his Yeezy. They will likely retain ownership of their respective company, along with any income from them.

However, things only get more complicated from there. Kim and Kanye’s $40 million Calabasas mansion, with its $30,000 bathroom sink, along with their other real estate like their $6.4 million Palm Springs home, Kanye’s $14 million Cody, Wyoming ranch, and Kanye’s $15 million Greybull, Wyoming ranch make up less than 5 percent of their collective assets.

Though Page Six reports that Kim will be able to keep any gifts Kanye gave her during their marriage, the divvying up of their real estate and trinkets, like Kim’s $1.3 million wedding ring, will be extremely tricky. “If they haven’t kept things separate,” however, “God knows what happens with the accounting issues,” Beverly Hills lawyer Joseph Mannis of Hersh Mannis LLP explained to Page Six. “That could be a gigantic pain in the neck to figure out what you’re doing.”

As for Kim’s gifts, they include $5 million worth of art, $4 million worth of cars, and $3.2 million worth of jewelry, according to Style Caster.  

The prenup, as first reported by Radar Online, could be completely bogus, however. E! News denied the details of the prenuptial agreement back in 2014. However, Kanye was extremely vocal on the subject in his 2004 song “Gold Digger.” In it he raps, “If you ain’t no punk holla, ‘We want prenup, We want prenup!’ Yeah, it’s something that you need to have, ’cause when she leave yo a** she gone leave with half.”

According to a source who talked to Page Six, “Kim is trying to get Kanye to turn over the Calabasas house to her, because that’s where the kids are based and growing up. That is their home.”

Kim owns all the land and adjoining lots around the house, but the source claims that Kanye owns the house itself. They have both put a lot of money towards its renovations.“

The two have an incredible combined wealth of over $2.1 billion, with new figures putting that number closer to $7.8 billion, with Kanye’s alleged $6.6 billion in assets and Kim’s newfound billionaire status. One thing is certain: making decisions won’t be easy.