FARRAH ABRAHAM ARRESTED FOR FIGHTING At the Beverly Hills Hotel

Farrah Abraham got busted at The Beverly Hills Hotel for fighting with an employee ... TMZ has learned.

The ex-'Teen Mom' and sometimes porn star was at the schmancy hotel Tuesday night and, according to law enforcement sources, she got into an argument with a male employee. We're told things got heated and, at some point, she allegedly struck the staffer. That's when someone called police.

Not shockingly, we're told cops believe alcohol was involved.

A source tells us Farrah was heard playing the "I'm a celebrity" card -- yelling things like ... you should know who I am.

Well, the police know now. We're told she's being booked for battery and trespassing.

Story developing ...