HBO has worked hard to maintain the secrecy surrounding the show's final season, but the Mother of Dragons couldn't resist telling her own mother the ending. When Stephen Colbert asked if she'd told anyone, Clarke explained to him what happened.
"I wasn't supposed to -- soz, lads," she said, adding in a not-so sincere-sounding apology. "I told my mum."
Funnily enough, though, her mother has already forgotten how the story unfolds -- even after getting to read one of the scenes. Clarke said they were talking about it later, and her mom had no recollection of what she'd learned. Now, unluckily for her, she's in the same boat as the rest of us: waiting for the series finale to air. Clarke said she didn't want to tell her a second time.
Watch below. Clarke also shares her feelings about the series ending, their wrap parties, and why co-star Kit Harington can't complain about his costume. "Game of Thrones" talk starts at the 3:38-mark.
"Game of Thrones" Season 8 premieres Sunday, April 14 at 9 p.m. ET/PT.