It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "No woman should come into bodily contact with another woman, for she will then describe her to her husband or to some (other) man as though he were looking at her."
"And when there are three people, two should not converse privately apart from the third, for that grieves him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10381