Michael Rubin held his annual white party in the Hamptons on Tuesday, and it was an event that featured stars like Leonardo DiCaprio, Kim Kardashian and Ben Affleck.

There also was one Boston Celtics player who attended that social media could not believe also was there.

The Fanatics CEO has an estimated net worth of $11.4 billion, according to Forbes. So it’s not a surprise Rubin has so many connections, especially in the sports world.

Tom Brady also attended the party, and he posted pictures from the event, including one with New England Patriots owner Robert Kraft.

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Kraft is a close business partner with Rubin, so it makes sense why he was there, and Brady’s inclusion speaks for itself. However, Grant Williams also took to Instagram and revealed he also was at the party. Twitter could not fathom a world where Jay-Z, Beyoncé and Williams were together at the same event.

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To Williams’ credit, he might get a payday if a team sends him a lucrative offer sheet, which the Celtics would have the option to match. And the four-year forward is first vice president of the NBA Players Association along with Boston teammates Malcolm Brogdon and Jaylen Brown.

Despite those credentials, he still isn’t quite a household name. But he certainly will enjoy getting the exclusive invites when they come.

Featured image via Bob DeChiara/USA TODAY Sports Images