The 30-year-old actress, who suck up ti Daenerys Targaryen, is seen wearing her blonde wig complete with a hoary hoodie in the behind-the-scenes clip.
She wittily captioned the post: “For gods objectives Emilia put the holiday champagne DOWN and put that wig back on! #firstdaybackinthepretendrealworld #dontdrinkanddrivedragonscapieche?”
While Emilia is at rest filming, her co-star Sophie Turner revealed that she had already wrapped up beforehand Christmas.
Sophie teased her character, Sansa Stark, has developed a “morsel for killing” in the upcoming season.
There will only be two more series of the HBO invention drama, although bosses confirmed last month that a spin-off prequel had been commissioned.
The incontrovertible two seasons will be shorter than usual with show shoots admitting there are just 15 hours of the show left.
In time seven, there will only be seven episodes, as opposed to the time-honoured 10.
However, actor Iain Glen, who plays Jorah Mormont, recently urged the episodes may be longer than expected.
He said: “They are taking the extent of time it takes to shoot 10 episodes to shoot just seven this year and six next year.
“There are 15 numerous hours left in Thrones as we understand it, but that may change, but that’s as far as we identify.”
Game Of Thrones season seven is expected to air on Sky Atlantic this summer.