Sahih Muslim Book 3, Hadith Number 664.

Chapter : One should draw around a curtain while taking a bath.

Umm Hani b. Abu Talib reported: It was the day of the conquest (of Mecca) that she went to the Messenger of Allah (may peace be upon him) and he was staying at a higher part (of that city). The Messenger of Allah (may peace be upon him) got up for his bath. Fatimah held a curtain around him (in order to provide him privacy). He then put on his garments and wrapped himself with that and then offered eight rak’ahs of the forenoon prayer.