Britney Spears has been barred from exclusive Los Angeles club Winston's after allegedly forcing a bartender to switch dresses with her at a Halloween party. Club owners insist the Toxic troublemaker is no longer welcome at the venue because her saucy antics have upset regulars. On 29 October (07) Spears reportedly insisted on switching Halloween costumes with a reluctant barmaid. Friends tell America's Life + Style magazine Spears loves hanging out at Winston's because she's smitten with manager Harold Karsenty, who is "a total stud". One venue insider says, "Harold loved the attention at first, but after a while he got sick of it... Britney caused nothing but drama." The news of the ban has upset Spears fans who use Winston's as a regular haunt. Stacey Kives tells Life + Style, "It was exciting when she was there. The whole bar would revolve around her."