▁Day d ream ▁spent ▁a ▁combined ▁six ▁months ▁at ▁the ▁top ▁of ▁the ▁Hot ▁ 1 0 0 . ▁To ▁promote ▁Day d ream , ▁Care y ▁emb ark ed ▁on ▁the ▁short ▁but ▁successful , ▁Day d ream ▁World ▁Tour , ▁visit ing ▁Japan ▁and ▁Europe . ▁ ▁Day d ream ▁became ▁Care y ' s ▁best - review ed ▁album ▁up ▁to ▁that ▁point ▁and ▁an ▁international ▁commercial ▁success , ▁debut ing ▁at ▁number ▁one ▁in ▁nine ▁different ▁countries , ▁and ▁in ▁the ▁top ▁five ▁in ▁almost ▁every ▁major ▁music ▁market . ▁It ▁was ▁Care y ' s ▁second ▁album ▁to ▁be ▁cert ified ▁diam ond ▁by ▁the ▁Rec ording ▁Indust ry ▁Association ▁of ▁America ▁( RI AA ), ▁den oting ▁ship ments ▁of ▁ten ▁million ▁copies ▁in ▁the ▁United ▁States . ▁The ▁album ▁made ▁the ▁top ▁five ▁of ▁the ▁best - s elling ▁albums ▁in ▁Japan ▁by ▁a ▁non - As ian ▁artist , ▁with ▁ 2 . 1 ▁million ▁copies ▁sold . ▁Day d ream ▁remains ▁one ▁of ▁the ▁best - s elling ▁albums ▁of ▁all ▁time , ▁with ▁more ▁than ▁ 2 0 ▁million ▁copies ▁sold ▁world wide . ▁ ▁Background ▁As ide ▁from ▁being ▁Care y ' s ▁second ▁highest ▁world wide ▁s eller , ▁Day d ream ▁served ▁as ▁her ▁most ▁personal ▁and ▁directly ▁influenced ▁album ▁at ▁the ▁time . ▁During ▁the ▁album ' s ▁recording , ▁Care y ▁grew ▁as ▁an ▁artist , ▁as ▁well ▁as ▁a ▁writer . ▁For ▁the ▁first ▁time ▁in ▁her