They got the right stuff, baby!

All five members of New Kids on the Block posed for a different kind of group photo this morning on Twitter -- with Donnie Wahlberg posting a pic of them wearing nothing but towels in what looks like a locker room.

"After 3 months cultivating, countless insults, thousands of requests to shave the " Wahlberg tweeted along with the pic ... which shows Donnie, Joey McIntyre, Jordan Knight, Jonathan Knight and Danny Wood all sporting facial hair.

Mustaches aside, the guys all look pretty good sans shirts -- especially considering they range from 39-43 in age.

Check out how more former teen idols have aged in the gallery above!

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