Singer Lily Allen
Singer Lily Allen arrives at the Metropolitan Museum of Art Costume Institute Gala Benefit celebrating the opening of "Charles James: Beyond Fashion" in Upper Manhattan, New York, May 5, 2014. REUTERS

Lily Allen has revealed she was offered the role of Princess Yara Greyjoy, opposite her real-life brother Alfie, in the hit TV series, "Game of Thrones." But apparently she declined, claiming there was too much incest in the role.

According to Billboard, Allen shared her decision during her "Ask Me Anything" Reddit session. She said she was offered the cameo role of Yara Greyjoy, but she declined since it involved getting felt up by her real-life brother Alfie, who plays Theon Greyjoy.

"They asked me if I'd be interested in playing Theon's sister. I felt uncomfortable because I would have had to go on a horse and he would have touched me up and shit. Once they told me what was entailed, I said no thanks," the singer said.

Although she was informed it was a cameo role, the character of Yara is quite huge according to The Guardian, since she has appeared in six episodes so far. But Allen was right about the horse and the incest. Theon Greyjoy does fondle Yara in her saddle before discovering that they're siblings.

"The Night Remembers" episode of "Game of Thrones," tells how Alfie had caressed his sister. Alfie met a woman he hasn't seen in years. As they ride horseback together, he caresses her, both inside and outside her clothes. Later, to his humiliation, he learns that the woman is actually his sister.

The role of Yara Greyjoy went to actress Gemma Whelan.

Despite turning down the part, Allen said she is still open for any other roles in the "Game of Thrones." She said she'd rather do a musical cameo like "Sigur Rós," who played a beset-upon wedding band during a recent episode of the TV show.

Before Alfie was known for his role in "Game of Thrones" as Theon Greyjoy, he was already known as the protagonist in one of Allen's song titled, "Alright, Still.' It was an unflattering song Allen wrote about her brother which ridicules him for wasting his life away with weed and computer games.

Allen and her brother Alfie had small roles in the 1998 movie, "Elizabeth."