It's like Phineas Timberlake is his dad's mirror. Jessica Biel shared a glimpse into her family's travels while touring alongside husband Justin Timberlake, and the recap included a sweet video of their 4-year-old son showing off a talent for dancing that is reminiscent of his father's. In the clip posted to Instagram July 30, Phineas jumped off a speaker backstage at one of Justin's shows while a band played music and the stage lights flashed purple and pink.