Sufyan (may Allah have mercy on him) says: I said to Abdur Rahman bin Qasim, "Shall I narrate to you a hadith from Umm al-Mu'mineen, Lady Aisha (may Allah be pleased with her), that the Messenger of Allah (peace and blessings be upon him) used to kiss her while he was fasting?" He lowered his head shyly for a moment and remained silent for a while, then said: "Yes, it is so."
Hadith Referenceالسنن المأثورة / باب تفسير الفرعة والعتيرة / 406