game of thrones cameo lily allen alfie allenIncest is kind of no big deal in the world of "Game of Thrones," but for singer Lily Allen, the ick factor was too much to take.

The songstress revealed in a Reddit AMA that she turned down the opportunity to play Yara Greyjoy, the sister of Theon Greyjoy -- played by Allen's real-life brother, Alfie (above).

"I've been asked to do a 'Game of Thrones' cameo, they asked me if I'd be interested in playing Theon's sister, and I felt uncomfortable because I would have had to go on a horse and he would have touched me up and sh--," she said. "Once they told me what was entailed, I said no thanks. I would be open to doing a musical cameo like Sigur Ros, though."

Allen is referring to a season 2 episode in which Theon hitches a horseback ride with an unknown woman. Only after fondling her does she introduce herself as his sister! Awkward!

When Lily Allen turned the role down, it went to actress Gemma Whelan. No doubt both brother and sister let out big sighs of relief.

Photo by Evan Agostini/Invision/AP

Game of Thrones
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George R.R. Martin's best-selling book series "A Song of Ice and Fire" is brought to the screen as HBO sinks its considerable storytelling teeth into the medieval fantasy... Read More

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