Z-List reality star Holly Montag –  no doubt much to her horror -- found herself part of the act during a comedy set for charity at the Laugh Factory in West Hollywood Tuesday night.

Montag was in the front row of the club, and a source tells RadarOnline.com exclusively that he personally witnessed Montag talking loudly and being generally disruptive during several of the comedians’ set. It got to the point where some of the comics made her a part of their jokes.

Then, it got ugly.

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