Remember those recent sob stories about Rachel Uchitel being a love junkie who just wanted someone in her life? Read this:

from www.tmz.com - Rachel Uchitel -- star of "Celebrity Rehab" -- has refused to fly out to an L.A. premiere party for the show -- and TMZ has learned it was all because she REFUSED to fly coach.

Sources connected to mistress numero uno tell us Rachel tried to catch a flight from NYC to LA moments ago ... but she couldn't lock down a first class seat -- a total deal-breaker.

Rachel then tried to book a last-minute flight to Vegas instead -- but struck out there as well because her flight was canceled.

So instead of flying with the plebes -- Uchitel took her $10 million ass back to her ritzy Manhattan apartment ... where she will watch the premiere of her show all by her lonesome.

Tub of ice cream optional.