Mario has been doing Kim's makeup for seven years and when she heard that his model canceled, she jumped on a redeye and flew to NYC to be his model for the seminar.
Here's Mario telling the class about the very special surprise:
It's kinda cute, Kim kinda looks a little shy about sitting up there in front of the class.
After she got all glammed-up, Kim took time to pose for a whole bunch of photos with the students.
We think it was super cool for Kim to fly across the country at the last minute to help out a friend in need...and we bet that is one seminar those students will NEVER forget!
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Gallery | Kim Kardashian's Top Fashion Moments of 2014