So my fiancé and I trying to have a more feminist orthodox wedding, and one thing we’ve heard is that (among other things) we can be more inclusive on the ketubah by having 2 halachic male signatures below the Aramaic and two additional female witness signatures below the English “translation”. However, when we asked a friend, she asked her rabbi (who is on the more yeshivish side) if this was okay for her to do, and he said any additional signatures beyond the main 2 would invalidate the whole ketubah. I was curious about this especially since even in modern orthodox circles it’s becoming customary for brides, grooms, and rabbis to sign the ketubah in addition to the two halachic witnesses. Is there any difference between bride/groom signatures and those of additional witnesses? What are the sources for the differing opinions?