Benaissa, 28, was sentenced to two years prison by a German court two weeks ago for knowingly passing on the HIV virus to a sexual partner. She was handed a two-year suspended sentence for causing grievous bodily harm and two of attempted bodily harm.

After keeping away from stage for some time, Benaissa appeared on Saturday to sing for a charitable fund-raising event for the benefit of AIDS patients.

Benaissa came to fame as a Eurovision contest winner in 2000 as a member of the girl-band No Angels. Benaissa confessed to the charges against her at the opening of her trial in Darmstadt, Germany.

The accusation was that she knew she was HIV-positive and continued to have unprotected sex with sexual partners without informing them of her infection.