Maisie Williams and Sophie Turner met when they were only 12 and 13 years old [1], respectively, but it didn't take long before they realised they were soulmates [2]. In fact, it was during their first Game of Thrones [3] screen test when "there was undeniable chemistry," and they knew they had to star in the show together. Ahead of the highly anticipated final season of GoT [4], the onscreen sisters and real-life besties sat down with Rolling Stone [5] to discuss the "firsts" in their relationship – the first time they met, the first time they went to the United States together, the first time they were proud of each other, and so many other incredible experiences [6].

The two have very different personalities on the show, but in real life, they couldn't be more obsessed with each other [7], and we can't get enough of "Mophie" ourselves. Maisie and Sophie gush over each other and talk about their "best friend day ever," which included two-for-one cocktails, shopping for matching sunglasses and backpacks, a Red Hot Chili Peppers concert, and of course, ended with getting matching tattoos [8]. Watch the video above, but be prepared to smile for 12 minutes straight.