Pari could be the one who overheard their talk.She doesn't love or care for Sonakshi at all.She will use this to trouble Sonakshi and cause her grief.She has never respected Sonakshi. She wouldn't be concerned if their marriage and family life is affected or Sonakshi and Rohit separate.She will even try to justify her affair with Rohan with this information or extract money from Sonakshi and Rohit to give her mother and show it as having been earned working with Rohan.
Pari doesn't have that much of brain to hire some third person like this kajal waala guy and threaten sona..
And this time pari has no such reason to do anything as her and rohan's affair isn't still in limelight.. Last time she leaked the news to take revenge from pooja... And with that it's done... She just taunts her...
And if she would have heard it... She would have then and there revealed it or would have indirectly started taunting pooja...
Somehow I think it's not pari this time.... It is definitely someone from sippy mansion...