'NSYNC reunited — and the photo they took together is tearin' up our hearts

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

A photo posted by Justin Timberlake (@justintimberlake) on

Everyone's favorite 'NSYNC mega-studs, now a little older and, er, grizzlier than we remember them, got together Monday night to celebrate JC Chasez's 40th birthday.

40th. Yes. Time flies when you're in a world-famous boy band.

But don't freak out too much: While Chasez isn't the first band member to turn the big 4-0 (Chris Kirkpatrick is 44), the rest of the bunch — Joey Fatone, Lance Bass and, of course, Justin Timberlake — are all in their 30s. Phew. (Still doesn't change Timberlake's eligibility status, but hey. A girl can dream.)