12/5/2016 10:50 AM PST BY TMZ STAFF
This COULDA been super awkward … but Alex Rodriguez apparently played it cool when his girlfriend reconnected with her billionaire ex-husband Sunday night … at an event PACKED with powerful nerds.
Of course, A-Rod is dating Anne Wojcicki — who was married to Google co-founder Sergey Brin until they split in 2015.
But it seems they’re on good (or at least decent) terms because they didn’t just hang out at the event last night … they teamed up onstage and addressed the crowd at one point during the awards ceremony.
FYI, Brin is reportedly worth more than $30 BILLION.
A-Rod and Wojcicki started dating earlier this year. Brin attended the event with his girlfriend, Nicole Shanahan … an accomplished lawyer/business mogul (who also happens to be smoking hot).
The event itself was wall-to-wall rich people and celebs … including Mark Zuckerberg, Vin Diesel, Kevin Durant and more.