Selena Gomez is revealing her bad blood with Taylor Swift…

The 22-year-old half-Mexican American singer/actress will make a cameo appearance in Taylor Swift’s upcoming music video for “Bad Blood,” which will premiere during the Billboard Music Awards on Sunday, May 17.

Gomez will play the character Arsyn, according to Swift, who shared a sexy poster of Gomez sporting a new black hairdo while holding a machine gun through Instagram on Saturday, May 16.

Earlier in the day, Swift also revealed a new Kill Bill-esque poster of herself standing next to model Martha Hunt, who has been cast as Homeslice. Swift, of course, will play Catastrophe. In the new poster, the pair are seen holding swords and appear to be prepping for a fight.

“Bad Blood” will also feature Karlie Kloss, Lena Dunham, Hailee Steinfeld, Kendrick Lamar and several others.