His children's nanny Cecilia Duncan has claimed that the singer hired her as a part-time nanny to look after his two sons and her dues were not paid to her.
She alleged that she often worked over 40 hours a week and was never even paid overtime, reported Digital spy.
Her lawsuit states that Duncan spoke to Usher about her concerns in 2011 but the 34-year-old ignored her complaints for over a year.
She is said to have been fired in September without being paid overtime fees.
Usher's representatives rubbished the claims of Duncan and termed them as "completely false".