Lily Allen turned down a role in Game of Thrones Credit: Karwai Tang/FilmMagic

Ew, we don't blame you, Lily! British singer Lily Allen revealed on Tuesday, May 13, that she turned down a cameo role in Game of Thrones—because it would have required filming an incestuous seduction scene with her real-life brother Alfie Allen.

The "Sheezus" hitmaker made the revelation during an "Ask Me Anything" session with Reddit, explaining producers of the hit HBO show had offered her the role of Theon Greyjoy's sister Yara.

"I felt uncomfortable," the party-loving star wrote, "because I would have had to go on a horse and he would have touched me up and sh--. Once they told me what was entailed, I said no thanks."

The episode in question, "The Night Remembers," aired in season two with Gemma Whelan ultimately playing the role of Yara. In the scene, Alfie's character rides horseback with Yara while he caresses her, both inside and outside of her clothing. He later discovers, much to his mortification, that the woman he was seducing was actually his sister.

Despite turning down the role, mom-of-two Allen insists she hasn't given up hope of making it onto George R.R. Martin's fantasy smash in another guise.

"I would be open to doing a musical cameo like Sigur Ros, though," the singer admitted.