The Big Little Lies star is one of the high-profile new additions to the cast, and will play Holdo in December’s The Last Jedi.
Speaking to Ellen DeGeneres on her talkshow, the star revealed a new image showing Holdo appearing to hold conference with the Resistance.
Per previous images, she has deep purple hair, rather pale skin, and is wearing a high-necked brown-grey outfit.
“I did the greatest experience of my life,” she beamed to Ellen.
“I felt like I was seven years old again.”
The actress did let slip that Holdo will use a gun at some point.
“Rian Johnson [director] keeps telling this embarrassing story about how when he got in the editing room – and I do have weaponry in a scene – he literally heard me making sounds,” she laughed.
“Because I’d only done it in my childhood. And on camera, you hear me going, ‘pew, pew, pew’, it’s so embarrassing!
“But I was so excited to be there, I really did think I was at play. It was crazy.”
Benicio Del Toro and Kelly Marie Tran also join the Star Wars realm as new characters.
The Last Jedi is out on December 14 in the UK.