Backstreet Boys teamed up with MeUndies to create festive underwear inspired by their new song, “Happy Days.”  The song is featured on their first Christmas album, A Very Backstreet Christmas. The song is featured in the 30-second promo.  The guys start in a suit-up top and holiday boxers on the bottom before transforming into holiday onesies for a Christmas Party.  A Very Backstreet Christmas was released in October and features 13 songs to start your holidays.  What is your favorite holiday song?

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