Natalie Dormer could have been playing a different role on "Game of Thrones."

The 32-year-old British actress, who plays Margaery Tyrell on the hit HBO fantasy drama series, revealed on "The Jonathan Ross Show" Saturday, Nov. 8, that she originally auditioned for a different character on the novel series-based show, Express reported.

"The story of that is, I went in to audition for another role and I've never told anyone what that other role and I won't tell anyone while we're still shooting the show," she told Jonathan Ross.

"It was serendipity that they didn't really know what to do with Margaery Tyrell because she's kind of a weird one in the books," she explained. "There's not really much about her so I had to flesh her out and to make her a three dimensional character within the show."

"I had watched the first season of 'Thrones' and like you [Jonathan] I was just like, 'I'm in!'" she added.

Dormer, who plays Cressida on "The Hunger Games: Mockingjay - Part 1" (out on Nov. 21), also talked about the scene in Season 4, in which Margaery snuck into the bedroom of his future husband Tommen Baratheon, played by Dean-Charles Chapman.

"DC, as I affectionately call him, Dean Charles, was 16 at the time," the actress said. "It was very awkward for me, I had a whole conversation about how that scene was written, I kind of altered how that scene was written."

"It wasn't as ambiguous and I was like 'we need to talk about this' and for a woman just to throw her sensuality, her sexuality at a young male is just so on the nose and so obvious and the last thing Margaery Tyrell is is obvious, she's far more skilled than that," she explained.

"I think she'd make a brilliant psychotherapist," Dormer added of her character. "I have this theory that she'd be the best therapist ever."

Last month, Access Hollywood asked Dormer if another wedding is in the cards for Margaery, and the actress jokingly answered: "What do they say, third time lucky? Is Margaery gonna be third time lucky?"

"Poor girl, she needs a break," she added at the People's Ones To Watch party at The Line Hotel in Los Angeles on Oct. 9.

In an interview with E! News at the Extremely Piaget launch and opening of the high-end jewelry house's Rodeo Drive flagship last month, Dormer also spoke about that scene between Margaery and Tommen.

"Margaery is just trying to play the next, you know, round of cards with the ones she's been dealt, so it's a particularly awkward situation for her, and young Tommen as well, so she's just trying to befriend the kid," Dormer explained. "She's just trying to befriend him. It's very awkward as an actress being given that specification. It's not an easy thing to do."