The on-screen sisters and real-life BFFs, who grew up on "Game of Thrones," open up about the final season and reveal which pop star already knows how it all ends.

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'Game of Thrones' stars Maisie Williams and Sophie Turner say some fans will be 'satisfied' by show's ending: 'Others not so much'

Stark sisters Sophie Turner and Maisie Williams are gearing up for the highly-anticipated final season of HBO's "Game of Thrones," which premieres Sunday, April 14.

The stars stopped by "Good Morning America" Tuesday to talk about the show's finale.

"Some people will be satisfied," Turner said.

"And others not so much," Turner and Williams said in unison.