Justified (2002)
This was JT's debut solo album, and it gave him two hit singles that nonetheless fell short of #1 hits. Still, it's a solid pop album that marked his true transition from child star to adult superstar.
FutureSex/LoveSounds (2006)
Questionable as the album title might be, "Sexyback" really did make a lot of people feel like sexy was coming back, imminently, in the form of Justin Timberlake.