>> reporter: tonight, the world's richest couple calling it quits. amazon ceo jeff bezos and his wife, mackenzie, announcing the surprise split on twitter -- "after a long period of loving exploration and trial separation, we have decided to divorce and continue our shared lives as friends." but no word as to what happens to bezos' estimated $137 billion fortune. >> this is going to be one of the biggest ticket divorces ever. >> reporter: the two have been married for 25 years and have four children. they met in the early '90s while both were working at a new york-based hedgefund, soon marrying and moving to seattle, renting a one-bedroom apartment as bezos launched amazon. they are now one of america's largest property owners. >> it is in both of their interests to try to keep this as quiet, as amicable as possible. >> reporter: the couple, maintaining the appearance of peace in their statement,