Mary Mary is a female American urban contemporary gospel duo composed of sisters Erica Atkins-Campbell (born April 29,1972) and Trecina Atkins-Campbell (born May 1, 1974). Formed in 1998, Mary Mary was launched into mainstream recognition following the release of their best-selling debut album, Thankful (2000), which contained the hit single "Shackles (Praise You)". Their followup album Incredible (2002), reached number one on the Top Gospel Albums chart. Their self-titled third album, Mary Mary (2005), which contains themes the public interpreted as a channel to the group's experience, contains the worldwide hits "Heaven", "The Real Party", and "Yesterday".