The boy band is back together... sort of.

N'Sync reunited for JC Chasez's 40th birthday last night at The Nice Guy in LA, and we can practically hear fans around the world rejoicing! Justin Timberlake and wife Jessica Biel, along with 50 other guests, partied the night away at the Hollywood hotspot.

"JC’s 40th... And, if you don’t know now you know…" JT captioned the above snapshot.

The group was formed back in 1997 and put out three smash albums before splitting in 2002. Rumors have swirled for years that the rest of the guys resented the "Sexy Back" crooner for going solo and achieving such massive success, but clearly there's no rift between them.

Just give us a reunion tour already!