Spears apologises for umbrella incident

Troubled star Britney Spears has apologised for attacking a paparazzo's SUV with an umbrella earlier this year - insisting she was "rehearsing for a film role".

The Toxic singer has attributed her bizarre behaviour outside estranged husband Kevin Federline's house - the night before she entered rehab in February - to preparation for a part in a movie about a much maligned wife who swaps places with her husband.