Britney Spears smacked down a heckler during her "Piece Of Me" show at the Planet Hollywood Resort and Casino in Las Vegas on Wednesday.
According to PEOPLE, the heckler called the 33-year-old pop singer a "fat bitch."
On a video (below) posted by TMZ, Spears reportedly responded, "f–––––– a––––––."
Spears then went into her song "Till the World Ends," noted US Magazine.
She is booked at the Vegas hotel until September.