Staffers with hit ABC show Dancing with the Stars are use to dealing with celebrities, but that was before they met Denise Richards.

”Denise Richards has already become the No. 1 least-liked contestant in the show’s eight seasons….” a staffer told the Chicago Sun Times , reported PopCrunch.

Show employees described the Richards as an “insecure” and “demanding” canker sore who ”complains about everything. …”

”It’s really clear that she’s one insecure woman. … She’s demanding and thinks she’s smarter than the rest of us … it’s really irritating.”

The once gorgeous actress has been a serial train wreck since her messy divorce with Charlie Sheen a couple of years back.