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.

She defined “brat” as an “attitude” or a “vibe” before using the term to discuss “Martha,” a documentary film about Martha Stewart that premiered on Netflix late last month. “When Martha gets mad about an old magazine article and she says that she’s glad the journalist who wrote it is dead, that is brat,” said Charli of the home decor guru.

So many people have asked me, ‘What is brat?’ And honestly, it’s just like, an attitude. It’s a vibe,” the singer said during the comedy sketch show.