Ben Simmons was with rich company for his birthday in Vegas over the weekend ... partying with a squad worth nearly $10 BILLION combined ... and TMZ Sports has the pics!!
The NBA Rookie of the Year kicked off his 22nd year with ragers at both Drai's and TAO nightclubs in Vegas on Saturday ... livin' it up with Sixers co-owner Michael Rubin (net worth: 3 billion), Patriots owner Robert Kraft (6 billion) and Meek Mill (okay, he's not a billionaire, but he's rich).