What singer made appearances during Keith Urban's Ripcord World Tour who also the winner of the  fourth season of "American Idol"?
Ripcord World Tour The Ripcord World Tour (stylized as the ripCORD World Tour) was the eleventh concert tour by Australian singer Keith Urban. The tour was in support of his tenth studio album "Ripcord" (2016). The tour began on 2 June 2016 in Bonner Springs, Kansas and concluded on 17 December 2016 with two shows in Brisbane, Australia. Brett Eldredge, Maren Morris and Dallas Smith were supporting acts for Urban in North America. The Oceania leg of the tour was co-headlined with American singer Carrie Underwood, with Buchanan as opening act.
Kimberly Caldwell Kimberly Ann Caldwell (born February 25, 1982) is an American singer, actress and television hostess, from Katy, Texas who was the seventh place finalist on the second season of "American Idol". She used to work as an entertainment correspondent and hosted various shows on the TV Guide Network. She released her debut album "Without Regret" on April 19, 2011.