She was released from hospital yesterday after a car crash last week and joined her co-stars Hilary Swank and Sam Rockwell at the premiere, where at the after party the trio laughed and hugged.
The 37-year-old actress and singer was admitted to hospital after a hit-and-run incident which left her chauffeured Lincoln Town car written off.
Conviction is based on the true story of Massachusetts woman Betty Anne Waters and her extraordinary 18-year crusade to overturn the guilty verdict that sent her brother to prison. Swank, 36, stars as Waters, an unemployed single mother who spends a decade earning a law degree so she can represent her brother in court.
The film has received mixed reviews from critics. You can watch the trailer after the jump!