It was narrated from a freed slave of 'Aishah that: 'Aishah said: "I never looked at (or I never saw) the private part of the Messenger of Allah." (Da'if)(One of the narrators) Abu Bakr (Ibn Abu Shaibah) said: "Abu Nu'aim would say: '(From) a freed female slave of 'Aishah.'

Sunan Ibn Majah Book 1, Hadith 707