To commemorate her tenth anniversary, Double released her first greatest hits album, "10 Years Best We R&B", which debuted at #2. Double also released her first collaboration album, "The Best Collaborations", which like her previous album debuted at #2, selling 63,413 in its first week. The album featured a new song, "Black Diamond", with the "Queen of Hip-Pop" Namie Amuro and the two performed the track at the finale of Double's 2008 live tour at Tokyo's Studio Coast, whilst also appearing together at the 2008 MTV Video Music Awards Japan.