While talking about her new award season favorite "Manchester by the Sea", the 36-year-old actress herself confirmed that she would headline the upcoming biopic, reported E! online.
"I figure there's one good day in the life of an actor, which is when you get the job," she responded when asked if the "Janis" biopic was happening.
"Before you get the job, you're like, 'Come on! I'm begging. I'm dying for this. I gotta have it! Please, I'll do anything. I promise... Take me! Take me!'
"And then you start worrying the next day. I'm in the worrying-the-next-day phase."
Sean is on board to direct the movie that will be adapted from "Love, Janis", a book written by the late singer's sister, Laura Joplin.
Based on Janis' letters she wrote to friends and family, it tells the rock icon's rise to fame as well as her struggle with alcohol and drug addictions in the last six months of her life. Janis died in 1970 at the age of 27 from a heroin overdose.