Rihanna and G.O.O.D. Music songstress Teyana Taylor engaged in a war or words on Twitter yesterday (Sep. 24) that took celebrity shade to new lows.

It all started innocently enough two weeks ago when Teyana Taylor posted an Instagram video featuring her a cappella rendition of Anita Baker's 'Caught Up In The Rapture.' Apparently amused by Taylor's post, Rihanna posted an Instagram video yesterday featuring her male stylist wearing backwards snapback and a curly wig singing--you guessed it--'Caught Up In The Rapture.' And now, it's an all out war.

Not amused by Riri's spoof, Taylor lashed out on Twitter, asking the Barbados-born beauty what's up: "Don't play with me @Rihanna f-ck all this industry sh-t, YOU & I know each other very well. Throwing sub 4 wat? u got my #, don't show off."

While Teyana's tweet has since been taken down, hiphollywood.com reports the singer had a few more things to say before all evidence was removed from her TL:

“Y’all could bully everybody else & get away wit that sh-t but that sh-t ain’t gone work ova here. So y’all could miss me with that NAVY sh-t,” Taylor posted. Then finished her rant by saying, “Petty is petty and shade is shade, b-tch knew what the f-ck she was doing.”

For her part Rihanna pulled no punches:

"I REFUSE to help your career...you will NOT get an @ from me! Not til you pay me! #nomorefreepromo #iRefuse"