Former Pussycat Dolls star Ashley Roberts will embark on a gruelling trek to reach the Machu Picchu historical site in Peru to raise money for charity. The singer will tackle high altitudes, intense heat by day and freezing temperatures at night during her 10-day hike through South America's Andes mountains range before arriving at the famous Inca landmark. Roberts will undertake the challenge to raise money for U.K. breast cancer awareness charity CoppaFeel! In a post on Twitter.com, she writes, "I'm excited & proud to be climbing Machu Pichu (sic) for the fab charity Coppafeel. Would love ur (sic) support! Anything counts!" Her mission begins on 25 September (14).