Lady Gaga Loses it at Citifield

What caused Lady Gaga to flip out at Citifield, home of the New York Mets? INSIDE EDITION has the story.

Gaga goes cuckoo! The singing sensation lost it at a baseball game, stripping down to her bra and glittering panties and cursing out fans and photographers!

Lady Gaga showed up at Citifield, home of the New York Mets, dressed in a leather jacket and fishnet stockings. When she got to her seat, she had a complete meltdown that shocked everyone.

So what sparked Gaga's tantrum?

Her front row seat was right behind home plate, giving photographers covering the game a clear shot of her. That's when she flipped out.

She stripped down to a bra and bikini bottom, and then, as the crowd of 32,000 started booing, she made obscene gestures.

Stadium officials moved her out of sight, to a private box owned by comedian Jerry Seinfeld.

Gaga's baseball flip-out came just one day after she showed up at her sister's high school graduation in an outrageous outfit, including a beekeeper's hat and see-through pants.