BOYBAND legend JC Chasez surprised theatregoers by performing NSYNC's biggest hit on stage.
The singer, 48, warmed up the crowd at one of the & Juliet Sing Along gigs last week.
JC, whose real name is Joshua Scott Chasez, appeared on stage at New York's Stephen Sondheim theatre and delighted fans by singing some of the group's biggest hits.
The super star looked totally different to when he first shot to fame as part of NSYNC back in 1999.
JC rocked a white t-shirt, grey bomber jacket and black trousers and completed his look with orange aviator sunglasses.
JC showed off his incredible vocal talent as he performed NSYNC's 2000 Bye Bye Bye.
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The crowd went wild as he sang the well-known chorus with fans singing along.
& Juliet Broadway's official Instagram page shared a clip with the caption: "Holding space for the lyrics of Bye, Bye, Bye."
Fans went wild in the comments section.
One said: "And this was when I was sobbing and hyperventilating 😂 SO GOOD."
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"One of the best voices of our time," a second added.
A third chimed in: "Voice still on point!"
Before being part of NSYNC JC starred on The All New Mickey Mouse Club.
NYSNC - which consists of Chris Kirkpatrick, Justin Timberlake, Joey Fatone, Lance Bass, and JC - formed in 1995, but split in 2002.
Ten years later they briefly reunited at the 2013 MTV VMAs.
And last year they reunited to single Better Place for Trolls Band Together.
Some of their best songs include Tearin' Up My Heart, I Want You Back and It's Gonna Be Me.
In March NSYNC performed together for the first time in 11 years.
Chris, Lance, Joey, and JC joined Justin on stage at his LA show – and wowed fans with the first listen of their new single, Paradise.
In 2019 the group joined Ariana Grande on stage during her headline performance at Coachella, but Justin didn't attend as he was on his solo tour.
Asked in 2021 about the prospect of an NSYNC reunion, while promoting his movie Palmer, Justin said: “I don’t have a crystal ball for what will happen with the music industry in the months, or years, to come.
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“That’s something that weighs on my mind in a heavy way.
“We will have to see what happens in terms of live music and I appreciate the question, but my focus right now is on Palmer.”