Go Inside Eminem And Rihanna's Monster Movie Awards Rehearsal

See the sneering snap before the show at 9 p.m. ET/PT on MTV.

Prepared to be terrified. Eminem and Rihanna are dealing with their internal demons tonight at the 2014 MTV Movie Awards, and they just shared a sneak peek from their rehearsal.

Rih Rih sneers at the camera in Converse, a white tee and jeans, while Em leans on her shoulder, tipping his head back as if he were saying "just try to mess with me."

The duo will be unleashing their duet "The Monster" at the show, airing at 9 p.m. ET/PT on MTV. Unless, that is, Em goes with a rendition of Broadway hit "Guys & Dolls" at host Conan O'Brien's request...

twenty one pilots will also perform at the show, playing "Car Radio," and Zedd and Ellie Goulding will team up to play selections from the "Divergent" soundtrack.