Usher (L) and Justin Bieber arrive at the Kids' Choice Awards on March 28, 2009 in Los Angeles. Later that year, Bieber's first album, "My World," would debuted at No. 6 on Billboard's charts.

Microsoft CEO Satya Nadella and Uber CEO Dara Khosrowshahi, for example, were spotted wearing a conference hat. All of the conference swag appears to carry the SV25 logo, referring to Sun Valley 2025. Business Insider

"This is the most pure version of Justin we've ever seen musically," says the source, adding that Bieber wanted to split from Braun "for a long time"