United Kingdom, Sept. 14 -- Sarah Paulson has revealed she and Naomi Watts have developed such a close "sisterly" friendship she now compares them to "two puppies in a box".

The 51-year-old actress grew close to Naomi, 57, after they worked together on Hulu legal drama All's Fair and new film Closing Night, which had its world premiere at the Toronto International Film Festival on Saturday (12.09.26).

The pair play estranged sisters in the feature directorial debut of Sarah's former American Horror Story co-star Cody Fern.

Speaking at the People, Entertainment Weekly and Shutterstock studio at TIFF, Sarah said: "(Naomi and I) had very little to do together (in) season one, but on the (press) tour we kind of had this magical fun. I woul...