. >> reporter: that transgenerational appeal? working. >> ladies and gentlemen, 98 degrees. applause] >> reporter: they performed to a packed house. album "let it snow", as well as class ickes and their hits. ♪ sunshine after the rain >> reporter: wait a minute, that should have been my cue to hit the stage. ♪ it's all >> reporter: yet somehow they forgot to tell me. ♪ it's all because of you >> reporter: this really hurts me. they're doing the song without me. i'm out. >> oh, honey. >> it was really sad. i was waiting to go on stage. i think i like hit the proper key. ♪ it's all ♪ it's all because of ♪ you >> we don't have to -- >> that was good. >> it was too painful for you. i don't want you to rehash it. listen to the guys, though, they sound great. >> they sound great, they look great. we'll have more on christmas day. >> be sure to tune in tomorrow. we have more stars dropping by the studio for a big surprise. >> yes, and to demonstrate how big this is going to be, here's a clue. pick surprise. huge surprise technology. >> huge. >> that's a big clue. >> huge. ♪i'm gonn