(Radio.com) *NSYNC have reunited, if only for one night. On Monday (August 8) the former superstar boy band met up to celebrate member JC Chasez's 40th birthday.

Justin Timberlake posted a picture of the reunion with his former band mates Lance Bass, Joey Fatone, Chris Kirkpatrick and Chasez, early this morning and let fans know it was a major milestone for his friend.

"JC's 40th� And, if you don't know now, you know�," Timberlake wrote in an Instagram caption. Earlier in the day, Kirkpatrick also wished Chasez a happy birthday with a throwback photo of the band during a red carpet interview. See the posts here.

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