Gaga has revealed that she hyperventilated while shooting the music video for 'Alejandro'.

The singer, who stripped down to her underwear for the clip, admitted that she clashed with the director and photographer Steven Klein on set after he asked her to remove her make-up and fake tan.

"We are both very strong-willed and we both have very specific visions," she admitted.

Gaga continued, "And I knew his specific vision and he knew mine so that it was like tugging at a rope together. And then we tied a beautiful knot! I wanted to bring him out of his comfort zone and he wanted to bring me out of mine."

"(He was) stripping me down, taking off all my make-up, no eyelashes, no liner, saying, 'I'm cutting all of your hair off' and not tanned...For me, I was hyperventilating, but it did force me to be myself," she explained.

As reported yesterday (September 8), Gaga recently upset PETA activists after posing for the cover of this month's Japanese Vogue Hommes, wearing only a bikini made from slabs of raw meat.