Ahmadi was arrested in mid-December after streaming a concert on YouTube where she performed without the mandatory hijab and in a sleeveless dress.
The four male musicians who accompanied her during the concert were also arrested.
On Monday, Iranian media reported that Ahmadi was released on bail of approximately 427,000 Swedish kronor. The four musicians have also been released on bail, according to the newspaper Ham Mihan.
According to Iranian law, introduced after the Islamic Revolution in 1979, women must cover their hair and neck, and they are not allowed to wear tight-fitting clothes in public. They are also not allowed to sing solo in public places.
The concert, which was recorded outdoors in Iran but without an audience, has been viewed millions of times and has attracted great attention in the country. The recording was uploaded to YouTube on December 11, and the next day it was announced that the concert had become the subject of a legal case, and on December 14, Parastoo Ahmadi was arrested.
