Charli XCX hosted “Saturday Night Live” this weekend and mentioned Martha Stewart’s feud with The Post journalist Andrea Peyser during her opening monologue. The singer, 32, used Stewart, 83, wrongly claiming Peyser was dead in her Netflix documentary, and Peyser’s subsequent “I’m alive bitch!” clapback, as an example of what “brat” is.

Somehow, in a year when Beyoncé and Taylor Swift both dropped massive albums, Sabrina Carpenter and Chappell Roan each rocketed to overnight superstardom, and Kendrick Lamar reduced Drake’s career to shambles,

Instead of the classic rom-com flirtation, Charli and the Please Don’t Destroy crew turn the meet-cute trope into a full-on roast session — hurling brutal jabs about each other’s looks and creative work. However, things escalate quickly when Charli crosses the line, delivering a devastating blow to Martin Herlihy by calling out his flat butt. Ouch.

Charli XCX is here to finally clear up what is “brat” or nat. In her tight opening monologue featuring her inaugural hosting stint on Saturday Night Live (pulling double-duty as a musical guest no less),

Charli XCX declared Martha Stewart’s feud with a journalist is “brat” during her Saturday Night Live opening monologue. The British pop star, who took the world by storm with her Brat album, described the US star as “brat” after she mistakenly claimed a journalist who covered her legal proceedings was dead.