Let's say you're Lady Gaga, and you're performing at SXSW. The lyrics to one of your new songs, "Swine", read: "You're just a pig inside a human body / Squealer, squealer, squeal out, you're so disgusting". How do you best illustrate the filthy sexual overtones of the track? Answer: get someone to throw up on you. 

Enter performance artist Millie Brown. Having mastered her regurgitation reflex, she swallows coloured water and vomits it back up, creating splatter paintings that saw her dubbed the Vomit Painter. Midway through Gaga's SXSW rendition of "Swine", Brown came onstage, chugged from a bottle of green liquid and dramatically regurgitated it all over Gaga right after Gaga screamed, "I won't play by your fucking rules! This is our world!" 

You can watch the TMZ video, below:

The two then hopped onto a mechanical bull at the side of the stage to perform some light scissoring. Brown threw up some black goo onto Gaga while Gaga screamed, "Fuck you, pop music! This is ARTPOP! Free yourself!" 

Millie Brown is a noted longtime collaborator of Lady Gaga's – she was filmed sitting on Gaga's lap and throwing up on her for one of the singer's concert videos during the Monster Ball tour. As far as we know, this is the first time Brown has ever done her act onstage. 

As some have noted on Twitter, Gaga's performance bears a passing resemblance to hardcore singer GG Allin's stage act, which notoriously involved the musician consuming a box full of laxatives before a show in order to unleash a torrent of onstage shit.