NSYNC Proves BFFs Are For Life With A Reunion For JC's Birthday

They aren't saying "Bye, Bye, Bye" to each other anytime soon.

The world's favorite boy band from our teenage years continues to prove that best friends are for life.

While we saw NSYNC reunite at the 2013 MTV Video Music Awards, these days, it's rare to get a glimpse of them all together.

It might leave you wondering how they stay so close after all these years on hiatus. (And when we might get some new music from the band.)

Luckily for us, they seem to be just as close as ever. On Monday night, Justin Timberlake posted a photo of the members celebrating JC Chasez's 40th birthday. 

Timberlake even captured the photo, "If you don't know, now you know," referencing Notorious B.I.G.'s famous line from "Juicy," but also confirming that still can kick back and enjoy time with each other.

JC's 40th... And, if you don't know now you know...

A photo posted by Justin Timberlake (@justintimberlake) on

Chasez also took to Twitter to thank everyone for coming out for his birthday.

Lance Bass, Joey Fatone, and Chris Kirkpatrick also reposted the group photo, proving the love we see is as real as it gets.

Long live NSYNC and the brotherly love.