Ms Dynamite won the Mercury Music Prize in 2002

The 23-year-old performer was arrested and released on bail after reporting to police last month.

The alleged incident took place in a Chinese restaurant in Wardour Street, Soho, on 17 September.

The Mercury Music Prize winner, whose real name is Niomi McLean-Daley, recently took part in the recording of the new Band Aid single.

A Scotland Yard spokeswoman said: "She had been due to answer police bail but there will be no further action in connection with this matter."

The star was arrested after she voluntarily went to a police station following the incident.

Outspoken star

She won the coveted Mercury prize for her album A Little Deeper in 2002 and has won a string of prizes since, including two Brit Awards and three Mobos.

Ms Dynamite took part in a London Stop the War rally and has performed for causes including Oxfam's Make Trade Fair campaign.

The outspoken star also made a plea to stop the rising tide of gun crime at a memorial for two girls shot dead at a New Year party in Birmingham in 2003.

Last year she was named media personality of the year at the Race in the Media Awards.