What singer made appearances during Keith Urban's Ripcord World Tour who also the winner of the  fourth season of "American Idol"?
Carrie Underwood Carrie Marie Underwood (born March 10, 1983) is an American singer, songwriter, and actress. She rose to fame as the winner of the fourth season of "American Idol" in 2005. Her debut album, "Some Hearts", was released in 2005. Bolstered by the huge crossover success of the singles "Jesus, Take the Wheel" and "Before He Cheats", it became the best-selling solo female debut album in country music history, the fastest-selling debut country album in Nielsen SoundScan history and the best-selling country album of the last 14 years. Underwood won three Grammy Awards for the album, including Best New Artist.
Australian Idol (season 7) The seventh and final season of the "Australian Idol" series began on 9 August 2009, to determine who would succeed Season 6 winner, Wes Carr. Beginning amid controversy, judge Kyle Sandilands was replaced by Sony Music record executive, Jay Dee Springbett. It was the first season where all four final contestants were eighteen years old or younger. Stan Walker was declared the winner on 22 November 2009.