Lady GaGa has become the latest celebrity to suffer an embarrassing nipple slip in an Instagram photo.

The Poker Face singer posted a shot of herself during a plane ride to Montana on Thursday (17Jul14) and clearly didn't realise her right breast was exposed under her jacket.

Gaga wrote, "Fashun (sic): Vintage Mugler on the plane Listening to Miles Davis My favorite is Flamenco Sketches."