The single "Hey Yo (featuring Colby O'Donis)" is available at Brookesworld.com as a download. You can purchase it from the official store or you can go to intunes by clicking the link below and purchasing it from there.

Hey Yo ft Colby O' Donis (at itunes) 

http://www.apple.com/search/store/?q=Brooke+Hogan+Hey+Yo