You don't want to mess with Lily Allen. In her bold new music video for 'Sheezus,' the title track off of her upcoming album, the outspoken British singer gets a little psychedelic and freely shouts out -- and even throws a little shade -- at her fellow female pop stars.

"RiRi isn't scared of Katy Perry's roaring / Queen Bey's gone back to the drawing," Allen sings in the vid, which features her awash in all different shades of neon. "Lorde smells blood, yeah, she's about to slay you / Kid ain't one to f--- with when she's only on her debut."

"We're all watching Gaga, LOL and haha," the British songstress continues. "Dying for the art, so, really she's a martyr."

But Allen is really on her game with the final line in the chorus, belting out: "I'm second best, we'll never cut it for the divas," she sings. "Give me that crown, b---, I wanna be Sheezus."

Check out Lily Allen's video for 'Sheezus' above!