Pentatonix is getting into the holiday spirit during their live concerts, and to show fans just how much, the group brought out none other than Joey Fatone for one of their recent shows — part of the group’s The Most Wonderful Tour of the Year trek — to sing *NSYNC‘s holiday hit, “Merry Christmas, Happy Holidays.”

The video starts with the a cappella group singing the title of the song on the into, until member Scott Hoyin takes a moment to tell the audience, “And we have special guest, *NSYNC’s Joey Fatone, everyone!” Fatone then came onto the stage in a red leather jacket to sing the track’s first verse: “We’ve been waiting/ All year for this night/ And the snow is glistening on the trees outside/ And all the stockings/ Are hung by the fireside/ Waiting for Santa to arrive.”

“This was ICONIC!!! Thank you @realjoeyfatone, you are amazing!,” the group captioned the video, shared on Wednesday (Dec. 20) to Instagram.

Fans were equally excited to see Fatone on stage — one fan in the comments section of the post wrote, “Just as my old teenage “*NSYNC mania” self was about to calm down after being revived after the VMAs and Trolls, y’all just want to make me act up again!!!” Another excited fan added, “Omg how did Joey not get more solos when he was in *NSYNC? Amazing!!!”

There may have been a bit of a generational divide amongst audience members, as one shared, “I was here and absolutely lost my mind. I almost cried. The younger girls behind me said ‘Who is that!?’”

Watch Fatone join the members of Pentatonix in the the video below.