Credit: NBCUniversal

The other three members of 98 Degrees will join "The Sing-Off" host Nick Lachey to perform on Monday's (December 23) finale at 8 p.m. ET on NBC.

The appearance caps a busy year for the quartet, which reunited in 2012 and released its first new album in 13 years, "2.0," this year, as well as joining The Package Tour with New Kids on the Block and Boyz II Men.

Lachey tells us that he's also hoping it won't be the last we see of the hitmakers best known for "Because of You," "The Hardest Thing," "I Do (Cherish You)" and "Thank God I Found You:"

"We'd be foolish to predict the future. I've learned the hard way that doesn't really turn out well. But I know we're having a great time doing what we're doing. It feels like the old days. For us that's the most important thing -- we're having fun. There's no sense coming back together if you're not enjoying yourselves. But right now we're really enjoying the process, enjoying each other. We hope that continues and hope that leads to more projects together. There's certainly no way to predict that, but I think if I was to answer that question right now I'd say yeah, I don't see why we would stop." 

Bandmate Jeff Timmons, however, is a bit more guarded in his prediction. "We had such a blast being out on the Package Tour; we never officially ended the right way, so it was a good way to wrap our career together," says Timmons, who's currently launching a male dancer reality show called "Men of the Strip."

But it may not be as final as that. "We had so much fun this summer that we're considering going out on tour next summer, maybe with a different sort of package or lineup. But we'll see. Nothing's for sure yet."

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