Well not really. It's actually Suneet Verma, but one can't help but think there's something Grecian in Sonam's look at Pammi Singh's bash. I think it's in her draping of the sari (almost toga-like) and her choice of flat sandals. It's certainly one of her favorite styles (though I'm not sure I can say a style chameleon like Sonam has a fixed style per se). See here and here for a couple of instances. I love this look on her as it captures a certain ephemeral quality.