Game of Thrones season 7: Sophie Turner says she told Maisie Williams about Ed Sheeran cameo by accident

Sophie Turner has admitted she accidentally told co-star and friend Maisie Williams about Ed Sheeran’s surprise appearance on Game of Thrones.

Sheeran had a controversial cameo in the first episode of season seven of the HBO drama, which was organised as a surprise for the Arya Stark actress.

Unfortunately Turner, who plays Arya's sister Sansa Stark, apparently let the secret slip when she asked her about when Sheeran would appear on the show.

"That was fun because Maisie loves Ed Sheeran and David [Benioff] and Dan [Weiss] had it as, like, a surprise for her," she told Entertainment Tonight.

"So they just, they didn’t tell her... I told her by accident! I was like: 'Oh, when’s Ed Sheeran coming on the show?' But yeah, they kind of did it as a surprise."

She joked: "I was kind of mad because I’ve been talking about [Justin] Bieber coming on the show for a while now. But it’s fine, I’m over it."

While Sheeran's appearance on the show has attracted criticism, Turner has spoken out in his defence.​

"I thought he killed it,’ she said. "Ed Sheeran is a hero! No one slay Ed Sheeran! That’s rude."

A new ‘weeks ahead’ trailer for season 7 of Game of Thrones was just shared at San Diego Comic Con.

Some of the most interesting moments in the clip include Jon Snow considering the advantages of an alliance with Daenerys, Cersei telling her court that Dany is a “threat to the realm” and “must be stopped”, and Euron Greyjoy parading through the streets of King’s Landing.

Melisandre is seen visiting Daenerys in Dragonstone to suggest she has “a role to play… as does another”.

Randyll Tarly, the father of Samwell turns up for a visit with Cersei in the Iron Throne Room - lately down one Valyrian sword.

We already know he hates Wildlings, and likely Jon Snow as well, thanks to his latest disastrous reunion with Sam.

Jorah Mormont is spotted in Oldtown. We heard him briefly on the last episode during a brief encounter with Sam, but it seems as though he hasn't been taken over by Greyscale (yet).

Littlefinger is also seen telling Sansa that “every possible series of events is happening at once” - hopefully meaning we're in for an action-packed season.

Game of Thrones airs on Sky Atlantic and streams on NOW TV.