Jullienne, who is playing Sophia, based on Melania Trump, says there is more to the former model than meets the eye.
"What you see isn't just what you get. She's ambitious and she has a plan and is playing the long game to execute it.
"I find I get defensive of my characters, I can justify their flawed traits and behaviour. Sophia is definitely not perfect, but who is?"
First Ladies was created by award-winning Irish author Nancy Harris and the play is described as a "fiendishly fashionable tour de force". It also features another Kiwi acting great, Rena Owen, who has taken time out from her busy US career to play the pivotal role of Sandy, the US press secretary.
The political hi-jinks, high fashion and fireworks will premiere at the ASB Waterfront Theatre in February before touring the North Island in March.