Justin Timberlake and NSYNC reunite for a very special birthday celebration

Justin Timberlake had a blast from the past with his NSYNC band members JC Chasez, Chris Kirkpatrick, Joey Fatone and Lance Bass. The former boy banders hit the town on Monday night (Aug. 8) to celebrate JC's 40th birthday.

While the boys have kept their reunions to a minimum since their split in 2002, they took time out of their busy schedules to mark JC's milestone.

Justin shared photographic evidence on Instagram and wrote: "JC's 40th... And, if you don't know now you know..."

TAP TO VIEW GALLERYNSYNC reunite and snap a picture together "JC's 40th... And, if you don't know now you know..." wrote Justin

NSYNC fans around the world immediately reacted, leaving nostalgic comments on Justin's photo.

"Wow, look at you guys... How I miss 'N Sync... I still remember how crazy I was for this boyband... How I waited for every new video to release and I think I saw your Disney concert more than 100 times on tv," wrote one follower.

"Love this!! So happy to see you guys are still friends!!" wrote another.

NSYNC group picture back in their day The former boy band have been nominated for a Hollywood Walk of Fame star

The band's last high-profile reunion was in 2013 when NSYNC performed at the VMAs. The pop stars put on their dancing shoes for the one-off reconciliation, which saw them sing hit songs "Girlfriend", "Gone", and "Bye Bye Bye".

At the time JC told Ryan Seacrest: "Literally, two minutes after seeing everybody you feel like no time has passed. Essentially everybody has remained the same and we all see each other at different times… but this was the first time we had a rehearsal together in ten years, so everyone was going, 'Can we go through this one more time slowly?' So that part was pretty funny."

NSYNC group picture back in their day Their last high-profile reunion was in 2013 at the VMAs

The next time the nineties pop stars will reunite will hopefully be in 2017; they have been nominated for a star on the Hollywood Walk of Fame.

"Everyone [in NYSNC] thinks that it's cool that they have been nominated for a Hollywood Walk of Fame star, and would love to go through with the honour, but they want to surround it around a milestone. The next milestone they have is a few years down the line (2020) for their 25th anniversary," a source told hollywoodlife.com.

HELLO! Canada magazine is available for your tablet and smartphone. Get HELLO! Canada, PEOPLE, Vanity Fair and over 100 more of the world’s best magazines for one low monthly price at Texture by Next Issue. CLICK HERE to sign up for a free trial.