It takes a lot to make Ellen DeGeneres blush -- but on today's show, Gwyneth Paltrow made everyone uncomfortable when talking about her grooming practices ... down there.

While promoting "Iron Man 3," talk quickly turned to the actress' very revealing dress on the red carpet for the movie's Hollywood premiere.

And that's where she shared a lil TMI.

Watch the video above to see what she said ... just be prepared to hear about shaving and Paltrow's "'70s vibe." Yeah, it's that kind of conversation.

Even Ellen had a hard time composing herself after the awkward chat!

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