Turkish pop star Gulsen was arrested on Thursday after an Istanbul prosecutor opened an investigation into allegations of "inciting people to hatred and enmity".
Gulsen Bayraktar Colakoglu, a 46-year-old woman known only by her first name, was arrested at her Istanbul residence and appeared in court.
A judge then remanded her in custody pending an investigation into comments she made about Imam Hatip Islamic schools at a concert in April.
Gulsen is a household name in Turkey and her story has made headlines in the country's highly polarized society.
In a controversial comment, Gulsen allegedly mocked an unidentified man on stage as "deformed" as a result of his upbringing at the Imam Hatip school.
Gulsen apologized on social media before her arrest.