as per title...i lost my diablo 3 cd and account...so if i buy reaper of souls will i be able to play it or i need existing diablo 3?? sorry noob question...

i lost the cd and cd key and havent play for almost a year...so when i get a new rig i want to install back because of RoS...i check my blizzard account and dont have anything linked to Diablo3...i afraid i simply used a temp email to create acc at that time...