Nicki Minaj wasn't the only special guest on "Good Morning America" this morning -- her left nipple made an appearance as well!

During her live performance on the show, Nicki's left breast popped out of her VERY low cut top ... revealing her full nipple to the entire East Coast viewing audience.

"GMA" hasn't aired on the West Coast yet ... but we're guessing ABC will most likely edit out the racy shot.

More Nipple Slips

Khloe K -- MAJOR Nip Slip on 'Fox & Friends'

HBO Star DENIED from Awards Party -- TOO DRUNK

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