Sports star Kylian Mbappé as well as A-listers Leonardo DiCaprio and Jennifer Lopez were among the celebrity guests at Bryn Mawr billionaire Michael Rubin’s Fourth of July party in the Hamptons, writes Seren Morris for Yahoo!Sports.

Tom Brady was also present, as were Justin and Hailey Bieber, Emily Ratajkowski, Ben Affleck, Travis Scott, Dixie D’Amelio, Jack Harlow, and Kelly Rowland, among many other celebrities.

While many know the names of the guests, few are familiar with Rubin himself. The Montgomery County businessman is the owner of Fanatics, a sportswear retailer, with a net worth of $11 billion.

He attended Villanova University for one semester before dropping out to pursue business ventures.

He is also an active social media user with over 600,000 followers on Instagram and 40,000 TikTok followers.

He is an advocate for criminal justice reform and co-chairs Reform Alliance, a non-profit that seeks to reform probation and parole.

During the pandemic, he founded a digital fundraiser, the ALL IN Challenge. As part of this, he enlisted the help of celebrities to raise a whopping $60 million to feed people in need.

Read more about Michael Rubin at Yahoo!Sports.

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More on the Hamptons party.