*NSYNC reunites at JC Chasez's 40th birthday party
*NSYNC got back together, but only to celebrate a major birthday for one of its members.
All five members of the popular boyband came out in support of bandmate JC Chasez's 40th birthday party Monday night -- and even posed for a group photo.
"JC's 40th... And, if you don't know now you know..." Justin Timberlake posted alongside an Instagram shot of the whole group -- including Chasez, Chris Kirkpatrick, Lance Bass and Joey Fatone.
JC's 40th... And, if you don't know now you know...
A photo posted by Justin Timberlake (@justintimberlake) on
Chasez posted the same image to his own Instagram along with the caption, "So many feels".
If Chasez turning 40 isn't enough to make you feel old, consider this: The group's final album together, "Celebrity," was released 14 years ago.