The former personal assistant to Robbie Williams has made claims of sexual harassment which Williams and his wife must answer to in court.

Gilles De Bonfilhs said he was wrongfully dismissed after 60 days of work and sexually harassed by Williams' wife, Ayda Field.

He claims Williams witnessed the abuse but failed to action to stop it.

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The couple have been married for six years and have two children.

They attempted to throw the case out by counter-suing based on "poor legal standing", but the judge refused and now they must appear in court.

The lawsuit states De Bonfilhs is suing the couple for "sexual harassment, failure to prevent sexual harassment, discrimination, breach of employment contract [and] fraud," Women's Weekly reports.

The first hearing will take place in Los Angeles on August 19.

- nzherald.co.nz