With the new season still a few weeks away, the Paris Saint-Germain star travelled to the billionaire's house for an extravaganza.
His future in the French capital remains unclear, but he took time away from football to party with the rich and famous.
Guests could be seen dressed in all white clothing at the mansion in the Hamptons, a series of seaside communities near New York City.
Mbappe was just one of a host of talent from the sporting world, with stars from football, NFL and basketball all featuring.
He was on hand to snap a picture with seven-time Super Bowl champion Tom Brady, who looked a giant next to the Frenchman.
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One of basketball's finest James Harden was at the party too and Philadelphia 76ers man Joel Embiid also snapped with Mbappe as West Ham fan James Corden joined the fun.
Host Rubin himself also had the honour of capturing a moment with the World Cup winner as he also welcomed stars from Hollywood.
Oscar winner Leonardo DiCaprio made an appearance at the bash, with Kim Kardashian and Kendall Jenner in attendance too.
Music giants Jay Z and Beyonce were also there alongside Justin Bieber and Travis Scott, with Usher seen with a microphone as the guests partied.
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Sticking with tradition, fireworks were launched into the night sky as they celebrated the United States' Independence Day.
Mbappe is now set to return to Paris as they look to defend their Ligue 1 title once again and strive for Champions League success.
However, his long-term future at the club is up in the air as he told them he will not extend his contract until 2025.
He could therefore leave as a free agent next year, and is demanding a salary of £206million to leave this summer.