London, March 8 (IANS) Singer Katy Perry was left red-faced at the Oscars after her boyfriend Russell Brand chastised her on live TV for swearing.

The 'I Kissed A Girl' hitmaker blurted out an expletive on the red carpet as she left the Academy Awards ceremony in Los Angeles Sunday night, reports contactmusic.com.

Perry, however, says she was unaware the late-night interview for British show GMTV was being broadcast live.

The couple was talking to a GMTV journalist when Brand was asked about his favourite moment of the evening and jokingly claimed he had seen dwarfs attending the event.

A giggling Perry replied: 'I call him on his bulls**t' and Brand appeared shocked by Perry's remark, telling her: 'Don't swear. It's morning in England.'

She appeared to be feeling embarrassed following her blunder.