A former room-mate and friend of Lady Gaga who says the pop singer cheated her out of overtime pay after serving as her personal assistant for more than a year can tell her story to a jury, a judge has ruled.

Lady Gaga's former personal assistant insists the star has "no right to privacy".

A songwriter and music producer claims pop star Lady Gaga squeezed him out of her lucrative career after he co-wrote some of her songs, came up with her stage name and helped her get a record deal.