Alison Janney
Alison Janney is in this movie, no?
She's the young lady sitting in the front at the disco party when they turn the TV on and find out that Steve's character is being sued for millions.
Do you mean this woman in the rainbow suspenders?
https://www.imdb.com/title/tt0079367/mediaviewer/rm408050177?ref_=ttmi_mi_all_sf_30
I can see the resemblance, but I don't think it's her. The Jerk is 10 years before her first IMDB credit.