Not one of her greatest hits: Rihanna caught on video lashing out at fan with her microphone

Rihanna struts her stuff at the Cardiff Millennium Stadium (Rex Features)

Rihanna proved her credentials as a Good Girl Gone Bad during the Birmingham leg of her Diamonds tour last night.

The singer was caught on film lashing out at a fan in the face with her microphone.

In a video posted to YouTube, the "S&M" singer can be seen walking down from the stage to meet the audience, who hold out their hands to touch her. But after one fan apparently held on for too long Rihanna reacted by hitting her with her gold microphone.

She later defended her actions on her Instagram account, saying: “Purpose!!! That bitch won’t let me go (sic).”

Rihanna began the UK leg of her Diamonds world tour at Cardiff’s Millennium Stadium last week and finishes tomorrow at Sunderland’s Stadium of Light.

The singer recently overtook Justin Bieber as the most-viewed artist on YouTube with a total 3.78 billion combined views to her 77 videos.