However, since her four-week stay in Promises rehabilitation centre, the singer has embarked on an intense daily workout schedule, and last month performed live for the first time.

Her performances have received mixed reviews, but demand is high with fans often paying $500 per ticket, despite Britney's reported lipsynching performances lasting for less than 15 minutes.

Advice has been thrown at the Toxic star from all quarters, but American Idol judge Simon Cowell offered: "Only Britney can save her career."