but no doubt bye-bye bye ♪ >> that is really cool. >> reporter: first week along, no strings attached sold 2.4 million copies and making it the fastest selling album of all time. despite the growing frenzy, the growing bank account and the growing admiration of millions of fans. >> how much do you like 'n sync? >> a lot. >> reporter: those close to justin say his feet never left the ground. >> you know, when people get this big in this business, sometimes they get a big head and their entourage start to grow and they are not approachable. justin was not like that.