An ex-Miss Teen Arkansas USA -- who was arrested last weekend for public intoxication -- is "mortified" about the situation ... and says she's "sorry if I brought any shame on my state."


A rep for the Miss USA Organization tells TMZ, it was Megan Burgess' resident assistant at her University of Arkansas dorm who called the cops on Megan for being a drunk nuisance -- and when police found her, she was sitting in the snow outside by herself.

But the Miss USA Organization isn't holding any grudge -- telling us, Megan "is a sweet girl who exemplifies the values of a Miss Teen title holder and is mortified about this."

The rep adds, "She even called over to us and said she was 'sorry if I brought any shame on my state.'"