Lady Gaga -- Full Frontal Nudity in Weird Yoga Forest

Lady Gaga finally got naked ... FULLY NAKED ... but it's weird. Really weird.

The video just surfaced, featuring a naked, hairless, crystal-spooning Gaga doing a meditation exercise inspired by Marina Abramovic, a famous performance artist.

The video shows Gaga doing "The Abramovic Method," which supposedly heightens physical and mental awareness.