Jeff Bezos' mistress has already hired a powerhouse attorney, Breaking Celebrity News learned exclusively. Moments after the marriage meltdown of the world’s richest couple was exposed and billionaire Jeff Bezos, 54, was caught cheating on his wife of 25 years, divorce proceedings are already in full swing.

The Amazon CEO's TV host mistress, Lauren Sanchez, who’s also the spouse of Hollywood mogul Patrick Whitesell, called in a lawyer last November to handle the high-profile split.

“Lauren and Patrick consulted Laura Wasser to mediate their divorce,” said a source. “They want to do it very privately and amicably."

Wasser is known to be one of the toughest family law attorneys in Tinseltown, having represented Angelina Jolie in her split from Brad Pitt, Kim Kardashian in her divorce from Kris Humphries and Gwyneth Paltrow in her “conscious uncoupling” from Chris Martin.

“They decided to work together on how to end their marriage in November,” added the informant.

As for the self-described “family man," and his novelist wife MacKenzie Bezos, 48 have three sons and one adopted daughter, who are ages 13 to 18.

Now that their split is confirmed, their upcoming legal battle may be the biggest in divorce-court history. MacKenzie could be entitled to an equal share of Jeff’s $144 billion fortune and everything that comes with it! From a $23 million museum in Washington D.C. and two mega mansions in Beverly Hills to a massive ranch in Texas, multi-million-dollar New York City apartments and an estate in Washington state. The world’s richest man also happens to be the country’s 28th-largest landowner.

Meanwhile, Sanchez has two kids with Whitesell, 53, the co-CEO of WME/IMG talent agency. The former Extra host also has a 17-year-old son with ex pro football star Tony Gonzalez.

As readers know, in a National ENQUIRER world exclusive, the tech genius has secretly been whisking his mistress off to exotic destinations on his $65 million private jet, sending her raunchy messages, erotic selfies – including an X-rated d**k pic! — and having secret rendezvous at palatial private estates.