"Game of Thrones" stars Dean-Charles Chapman and Nell Tiger Free are dating in real life while they play siblings in the HBO hit series..

Seventeen-year-old Chapman plays the role of Tommen Lannister in "GOT" while his 15-year-old girlfriend actually plays his sister Myrcella, TVGuide notes.

Although their surnames are Baratheon on "GOT," they are really Lannisters by blood because they are the love children of twins Jaime and Cersei Lannister, but they don't know it yet. Will they ever find out?

In real life though, Chapman and Free are not blood-related.

The two teenagers have not made any official announcement about them dating as of yet. Social media updates hint that they are dating since Chapman is posting pictures in hotel rooms and on camping grounds with Free.

Myrcella was killed off in the Season 5 finale so the two stars may not have been on a business trip when spotted together, although she could still be alive since there is always speculation and hope that showrunners did not kill off favorite characters. Who could forget the discussion about Jon Snow's "fake" death?

Meanwhile, the show continues to steer away from the original plot of George R.R. Martin's novels leaving fans in the dark about what could actually happen next. Seasons 6 and 7 are already in the works so fans have a lot to look forward to.

Martin hinted to Geek Wire that the show might finish before his novel series.

"The show is moving forward like a locomotive, or sometimes a jet locomotive," Martin said. "They're writing 60-page scripts, I'm writing 1,500-page novels. So who... knows?"

He also mentioned that he is no longer worried about the series beating him to the finish line.

"... I'm just going to tell my story, and they're telling their story and adapting my books, and we shall see," Martin said.

Will the HBO series spoil Martin's big finale? Or are they starting to be two entirely different stories by now?

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