The School of Rock star has filmed a video for the Ask4More drive ahead of America's National Equal Pay Day on 14 April (15) in which she details her own personal experience with the pay gap between the sexes.

In the clip, Silverman claims that in the early days of her stand-up career, she was paid just $10 (£6.30) to perform at a New York comedy club, while a male colleague earned $60 (£37.50) for the same show.

She says, "If you work a job and a man is working the same job, you should get paid the same. I don't think anyone is asking for anything that is more than fair... Go ahead, ask for more."