The 34 year old, who plays secretary Lois Sadler on the hit show, has peeled off for a spread in the August (10) issue of the men's magazine.
And Flanagan, who previously enjoyed quirky roles on U.S. sketch comedy series MADtv and hit show Curb Your Enthusiasm, admits she relished the photoshoot - because she never gets to play pretty on screen.
She tells the New York Daily News, "I'm a character actress. The parts I play, I'm usually a crazy heroin addict or a lunch lady. Nobody's ever asked me to take off my clothes, or even kiss somebody.
"I guess I haven't been seen as a sexy person, and sometimes not even as an attractive person.
"I have to say, just for myself to go to a job and feel pretty, that was kind of cool."
The actress, who plays secretary Lois Sadler on the hit show, has peeled off for a spread in the August (10) issue of the men's magazine.
She says, "Part of the reason (I decided to pose) was because it scared me, and I thought it was exciting that something still scared me.
"I was really nervous about it, and then I thought the only thing that would be embarrassing would be if I hated my body."