The new mama rented out Six Flags Magic Mountain in Valencia, California for their friends and fam to celebrate the rapper's bday.
According to E! News, Kendall Jenner, Kim Kardashian, Kourtney Kardashian, and Kylie's BFF Jordyn Woods were all in attendance and luckily for us, the occasion was heavily documented on social media (including a particularly ~extra~ cake).
Check it out: