Britney Spears wants her comeback performance at the 2007 MTV Video Music Awards to be "shocking", say reports.

It was revealed yesterday that the 'Toxic' singer had taken on Madonna's choreographer for the performance, but now it has been reported that she has also employed the services of magician Criss Angel to spice up her routine.

A source told The Sun: "She's planning it to be a big comeback performance." Spears' aim is to be "shocking", they added.

The pop star is also rumoured to be debuting her much anticipated single 'Gimme More' at the event.