Kim Kardashian -- Gone Into Hiding

Kim Kardashian has gone into lockdown, sources close to KK tell TMZ, and she went to great lengths yesterday at LAX to conceal her true location.

Kim's airport arrival caused mass hysteria among the paparazzi (see below). According to our sources, the paps trailed Kim from the airport -- but little did they know ... Kim pulled a switcheroo, switching cars mid-ride, and disappearing to a secret hideout.

We're told Kim will be staying indoors until she begins filming on the Tyler Perry movie "Marriage Counselor." That means Kim will be missing her mother's birthday dinner ... and brother-in-law Lamar Odom's birthday dinner as well.

Our sources say the attention surrounding her because of the divorce is too much for her ... and she's laying low until it dies down.

We're told only her family and a few close friends know where she is.