India, July 14 -- Jay-Z and Rihanna dropped a surprise by reuniting for a historic performance at the New York City's Yankee Stadium during the final night of Jay-Z's sold-out, three-night concert, Extra Innings.

The concert celebrated both the 30th anniversary of Jay-Z's debut album 'Reasonable Doubt' and the 25th anniversary of 'The Blueprint.'

The high energy show has sparked huge global interest in the business empires of Rihanna and Jay-Z: two hip-hop and R&B world's biggest names. Both are billionaires, but a look at their finances shows Jay-Z is significantly wealthier than Rihanna.

Here is a breakdown of their nearly $4 billion combined wealth.

Forbes' latest numbers show Jay-Z has a huge net worth of about $2.8 billion. That ...