More details about the production of the Game of Thrones Prequel are emerging, including a glimpse of Naomi Watts' look. The 50-year-old star seems to unintentionally slip her wardrobe and makeup trailer, revealing the possible wig she may wear.

HBO is busy filming the spinoff series in Northern Ireland. Just like the original series, the production has tight security. But, eagle-eyed fans have been leaking the filming location and even monitoring stars' posts on social media.

So when Watts shared a now-gone Instagram story inside a trailer, she unconsciously gave everyone a glimpse of her looks in the Game of Thrones Prequel. The actress was sitting in a make-up chair while giving a shoutout to her friends starring on another HBO series, Big Little Lies.

"Perfect way to start a 5am work day!! #biglittlelies," she wrote on the post. Here, her hair was neatly pulled backward and seemed ready to wear a wig cap, similar to Emilia Clarke's look when she was about to wear Daenerys' hair as seen on the HBO documentary, The Last Watch.

There was also a brunette-colored wig behind her. Hence, there are speculations it is the hair she is going to wear in the Game of Thrones Prequel.

It'll be no surprise if Watts wears a wig in the spinoff series. Besides, wigs have been a huge part of the original series, per Decider.

Meanwhile, Twitter accounts dedicated to following the production of the Game of Thrones Prequel revealed new snaps taken from the location shoots. Here, Naomi Liston, the original series assistant locations manager and now the plain old locations manager, is busy working on the new spinoff series.

Horse mistress Camilla Naprous also returns to work on the new show to provide horses, Winter is Coming noted. It is not far that the prequel series may feature the same crew members from the original series as its production company, Endless Winter Productions, is the same firm behind Game of Thrones, Fire & Blood Productions.

Titanic Studios also bears a new orange mammoth sign, which is bigger than the pink signs that meant Game of Thrones was in town. The orange sign indicates that the spinoff series is filming around. There is also a stone arch inside the Paint Hall at Titanic Studios and a pile of bricks.

Meanwhile, The Extras Department, the company who provides extras for the HBO series, posted a casting call on Facebook, looking for a 1-year-old blonde baby girl. Although it is not yet revealed whose character the kid is going to play in the Game of Thrones Prequel, there are assumptions it could be the young Lann the Clever.