1. The good ol’ days.
Source:Getty
2. Way back when windbreakers were cool.
Source:Getty
3. This actually happened.
Source:Getty
4. Oh, the 2000s.
Source:Getty
5. Never forget.
Source:Getty
6. Dirty “Pop” days.
Source:Getty
7. Stunting in a velour tracksuit.
Source:Getty
8. Looking dapper, JT.
Source:Getty
9. Suit and tie.
Source:Getty
10. These days, Justin’s style is consistently smooth. Happy birthday!
Source:Getty