Lady GaGa has posted a picture of herself washing green vomit from her skin following her controversial performance at the South by Southwest festival in Texas.

The Poker Face star hit the stage at Stubb's Bbq restaurant on Thursday night (13Mar14) for her first ever gig at the Sxsw event in Austin, and she made headlines by inviting a self-proclaimed 'vomit artist' to share the stage with her.

The woman threw up green and black liquid over the singer during the show as part of a performance art piece, and Gaga shared her extensive post-gig ablutions in a candid snap for fans posted on her website.

The singer published a picture of herself floating naked in a bath of murky green water after the show, with the caption, "I loved every moment with you Austin. Last night's show healed my soul. Creative Rebellion is Artpop. Release yourself from every expectation. Be free."