Britney Spears Fires Back at Haters During Las Vegas Concert (VIDEO)

You want a piece of her?

During a performance in Las Vegas on Wednesday, Britney Spears blasted a heckler who reportedly called her a “fat bitch.”

In the video above, the “Work Bitch” singer can be heard saying “f–––––– a––––––,” seemingly in response to the audience member’s insult.

Britney Spears Wows the Crowd in Las Vegas

Oops, Britney Spears has done it again – she’s thrilled a packed house of fans.

The pop starlet, 29, took to the Palms Casino Resort’s Rain Nightclub stage in Las Vegas Friday night, previewing three of her new songs from her upcoming Femme Fatale album, which will hit shelves on Tuesday.