their second album, aptly titled "no strings attached." ♪ baby bye-bye bye ♪ ♪ it ain't no lie ♪ baby bye-bye bye >> it's really cool! [ screaming ] >> in the first week alone, "no strings attached" sold 2.4 million copies, making it the fastest-selling album of all time. ♪ much better ♪ once you're gone >> despite the growing frenzy, the growing bank account, and the growing adoration of fans -- >> how much do you like 'n sync? >> a lot. a lot. a lot. >> those close to justin saying his feet never left the ground. >> you know, when people get this big in this business, sometimes they get a big head, and their entourages start to