- Mark Zuckerberg turned 40 this week.
- The Meta CEO hung out with Bill Gates in recreations of his old bedrooms for his birthday bash.
- Zuckerberg isn't the only billionaire to celebrate with a lavish — and slightly bizarre — party.
Mark Zuckerberg marked turning 40 this week by channeling his inner Eminem, squeezing into recreations of his old bedrooms, and hanging out with Bill Gates.