Sarah Silverman Joan Rivers 'Wasn't Done' Being Funny

9/5/2014 6:15 AM PDT

Sarah Silverman -- Joan Rivers 'Wasn't Done' Making People Laugh

Sarah Silverman took the passing of Joan Rivers very hard ... commiserating with Jimmy Kimmel Thursday night and cracking a few fashion jokes at Jimmy's expense ... like Joan would have. 

Silverman told Kimmel she just heard from Joan last week -- she reached out to congratulate Sarah on her Emmy. Silverman added that Joan told the most "hardcore jokes on TV" on her show, "Fashion Police." 

Sarah and Jimmy proceeded to rip each other, Rivers-style. Joan would have been proud.