What did Sara Ali Khan and Rhea Chakraborty bond over?

Kareena Kapoor threw a party to celebrate her stepdaughter Sara Ali Khan signing a film with director Abhishek Kapoor, opposite Sushant Singh Rajput. Sara walked in with alleged boyfriend Harshvardhan Kapoor, and together they made their presence felt despite the media glare. What was interesting, however, was the presence of Harshvardhan’s alleged ex-girlfriend, Rhea Chakraborty. Well, Rhea walked into the party with nonchalance and interestingly, walked out and drove away with, hold your breath, Sara Ali Khan. 

Now we’d love to be a fly on the wall of the, err, car and know the girl talk between Sara and Rhea. Wouldn’t you?