I haven't seen it, but I'd expect it to be pretty rare, because the capitol will probably rarely have enough disorder to trigger a rebellion. The times I've seen outright rebellions have always been provinces with a school, where the "clamor for change" modifier overpowers a weak garrison, especially if a pleasure garden has been raided by an enemy. The AI almost always builds to a full stack in the capitol and is pretty aggressive about protecting the main province.