Britney Spears knocks out a paparazzo in the video for her new single 'I Wanna Go'.

The 29-year-old popstar revealed a teaser trailer on her twitter page yesterday (19.06.11) which shows her swirling a microphone lead around her head before hitting the unfortunate photographer with it ahead of the video's full release on Wednesday (22.06.11).

Although Britney has been criticised for her fuller figure recently, the trailer shows off a flat midriff as the singer sports an orange bra beneath a white leather studded jacket.

'I Wanna Go' is the third single from Britney's platinum selling seventh studio album 'Femme Fatale'.

Britney is currently performing on her 26 date 'Femme Fatale' tour with support from Nicki Minaj and her manager LARRY RUDOLPH revealed the stage's post-apocalyptic theme was influenced by last single 'Till the World Ends.'

He explained: "This is exactly the direction we're moving in. 'Till the World Ends' keeps becoming a theme for us. The way we come up with a concept for a show like this is we sit with Britney, she talks to us about what she's interested in and what excites her."