Speaking to Entertainment Tonight at the New York City premiere of the eighth and final season of the HBO show, Turner, 23, revealed that Williams, 21, will be the maid of honor at her upcoming wedding to Joe Jonas.

“I don’t know why she’s thinking about [what she’s wearing to my wedding]. I’m giving her the bridesmaid dress!” Turner said after she found out Williams told ET she was trying to pick out a dress.

“She’s my maid of honor! One of two,” Turner added.

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Turner and Williams have grown up together in the public eye, playing the respective roles of Sansa and Arya Stark since season 1 of GoT premiered in 2011.

Turner and Jonas, 29, have been together for two and a half years and got engaged in October 2017. The musician was also in attendance at the star-studded premiere and Turner told ET it meant “so much to have him here.”

“It’s just like, the best support, the best person to calm me down and keep me calm, and if I end up crying, I have a shoulder to cry on,” she said. “So, it’s good. I’m so happy that he’s here.”

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Appearing on The Late Late Show with James Corden last month, Jonas, 29, revealed that the couple is planning to tie the knot this year.

“We’re going to have a summer wedding, which I’m looking forward to,” he said. “It’s going to be a lot of fun.”

“You know, her family’s all from England,” he continued. “I thought I’d be marrying into a family where I would become a soccer fan, a football fan — find my allegiance for a team. [But] her whole family doesn’t like football, they like rugby. So now I have to figure that out and we’re going to have a flag rugby game at the wedding and a flag football game.”

“If all the groomsmen show up with black eyes and broken arms, I’ll be proud,” he added with a laugh.

Game of Thrones returns April 14 at 9 p.m. ET on HBO.