Joan Rivers took her “jokes” too far yet again this week, when she hurled a trans slur at the first lady, shortly after officiating a gay wedding at a book signing for “Diary of A Mad Diva.”

Inquiring about the impromptu ceremony, an unidentified reporter asked controversial octogenarian when we will have a gay president, to which she replied, “We already have it with Obama, so let’s just calm down.”

She then goes on — unprompted! — to say “You know Michelle is a tranny.” When the reporter attempts to clarify, she responds: “A transgender. We all know.”

Click over to Vincent Paolo Villano’s 2012 op-ed for The Advocate, should you need a reminder of why calling cisgender women trans (even without the use of slurs) “only furthers the marginalization of women and transgender people.”