Kim Kardashian's Back in L.A.

Kim Kardashian is finally back in Los Angeles ... safe and sound with her 2 kids.

Kim cradled Saint -- who's too freakin' adorable -- while her mom, Kris Jenner, carried North off the private jet they took Thursday from NYC to L.A. Looks like Kanye West stayed behind on the east coast ... he's resuming his tour Friday night.

As we first reported, Kim's pulling back on flaunting her wealth -- and she was clearly understated when she touched down.

As much as you can be while stepping off a G4.