Martina McBride has given her support to the YWCA of Nashville's holiday auction. Items up for bid online include a portrait of McBride painted by Rachel Kice, a member of the MuzikMafia. Other celebrity contributors include Big & Rich, Diamond Rio, Kenny Rogers, Carlos Santana, NFL player Mark Tuinei and Clay Walker, among others. The auction closes on Wednesday (Dec. 12). McBride will host her annual YWCA celebrity auction during the CMA Music Festival in June 2008.