For me, like most have already said it's 3rd trimester and as late as possible. Overdue is best. There's a point where the baby drops into the birth canal and the belly actually looks smaller (I've witnessed this IRL)
However if it doesn't and a woman goes overdue Holy moly the huge sexy bellies are amazing.

I like early little bellies, when the body is starting to change, warp, and become unfamiliar. That cute tummy poking out is just.. mm!