>> i always felt like i was like mowsart's older brother. he's so good at what he does and he's so -- you know, he hits on every cylinder all the time. >> it's kind of like you're describing a -- >> reporter: exactly. that's exactly what he is. he is a salvant. >> reporter: it wasn't justin's only talent in the spotlight, so was his love life. >> britney spears and you. this is "larry king live." >> we are dating. >> reporter: from the moment they confirmed their relationship to the moment it ended britney and justin were a tabloid dream. despite it all, justin remained focused on the music. taking the lead in crafting the group's third album "celebrity." ♪ >> reporter: which included a lead single that seemed to take aim at 'n sync's detractors who labeled their music pop.