Stark strong! "Game of Thrones" costars showed up Thursday night to support Maisie Williams, who's starring in the play "I and You" in London.

Richard Madden, who played doomed older brother Robb Stark on the HBO series was there, as was Kit Harington (Jon Snow) and John Bradley (Samwell Tarly).

Williams shared a sweet Instagram photo of her and Madden hugging it out. Madden shared the same photo, with the caption: "Last night watching Maisie Williams being brilliant in her new play."

The now 21-year-old actress makes her stage debut in the play, which is about a housebound girl whose only social life is social media... until a classmate decides to pay her an unscheduled visit.

Her next movie, "The New Mutants," is out August 2, 2019.

As for Madden, he's be in Elton John biopic "Rocketman" as John Reid, the musician's boyfriend and manager. That's out May 31, 2019.

The former castmates recently reunited for Harington and Rose Leslie's wedding.

[Via EW]