Kirke, who is pregnant with her second child, had no intention of pursuing a Hollywood career when she was asked to join the cast of Girls by her friend Lena Dunham - the drama's creator and star.
The actress - the daughter of Bad Company rocker Simon Kirke - admits she is grateful for the opportunity, and the pay cheque, but would rather devote herself to her artwork.
She tells Vice magazine, ""One of the best parts (about fame) is that I can sufficiently support my kids. At my age that's pretty hard to do without struggling or taking money from my parents, and I don't have to do either. But it has taken a lot of time and energy away from my work as an artist...
""Acting is secondary - I don't feel like it's going to stick around because it's not something I want to do forever. My art has always been my top priority and I have far more experience in that field than I do in film.
""It's hard to explain without sounding like a d**k. I'm not that person. I'm really grateful for such enjoyable work, I just don't feel as though I have any clout as an actor. I haven't earned it.""