Agree with Sushmita Sen. A woman of Bengali descent who is very intelligent and striking, if not exactly beautiful in a traditional sense is Arundhati Roy. Oronnya is obviously right, intellect, charisma and personality has such an impact on how attractive a person is perceived to be:
(She's above 50 now, so this isn't a recent picture!)
Maybe it's because of my woeful knowledge of Indian Cinema but I had, for a long time, thought Tabu was Bengali
(Yes, I only saw her in the Namesake and Hera Pheri and yes, I know neither Irrfan Khan or Kal Penn are Bengali) There is a quiet dignity about her acting, which is attractive.