Jessica Chastain -- I'M DOWN TO POSE NUDE ... But Not For Playboy

Hugh Hefner's gonna be pissed ... 'cause "Zero Dark Thirty" star Jessica Chastain tells TMZ she's totally down to get naked in front of a camera ... but it will NEVER be for Playboy.

The Golden Globe winner was leaving the Brentwood Country Mart yesterday when we congratulated her on locking up the cover of Vogue -- and Jessica told us for her next shoot, she's hoping to do something a little more "risque.'"

Awesome.

So, naturally, we brought up Playboy ... but Jess shot that down hard -- saying, "I'll be naked in other magazines but not Playboy."

For the record, Chastain's not just talking the talk -- she's been naked in a couple of movies before "ZDT" ... including "Lawless" and "Jolene" ... the latter of which happens to be available on Netflix.

Chazz Palminteri's also in "Jolene" ... but don't worry -- he's totally clothed.