Leila Amer appeared at the end of December in a music video called "Boss Oumek" ("Look at your mother") which includes sensual oriental dance and suggestive gestures.
Musicians' union president Hany Shaker, a male singer known for his conservative stance, last week announced on the private channel Dream TV that Amer had been expelled from the union.
Her case comes less than a month after another female pop singer was sentenced to two years in prison for "inciting debauchery" over a racy video.
Yesterday her sentence was reduced on appeal to a year in jail.