He's sold more than four million albums in the last two years and is a more or less constant presence on the iTunes and Billboard charts. So when Justin Bieber announced that he was recording a Christmas album for this year's holiday season, it automatically became one of the fourth quarter's most highly anticipated releases.

At this point, Bieber could probably hum carols through a kazoo and turn it into a hit, but give him credit for not phoning it in -- not only will his Christmas collection reportedly consist of all original tunes, but he's lining up some high-profile guest stars from across the musical spectrum, including young country act the Band Perry.

As he tends to do, Bieber broke the news on Twitter, where he sent the band a public message reading, "Heard the final version of our song for the Christmas album!! Love it. glad to have you!" The Perry siblings tweeted back, "Thx JB. Thrilled to be a part!"

We've also already heard that Taylor Swift could be involved in some capacity, and we know Bieber's heroes Boyz II Men made an appearance for a track titled "Falalalala."

There still hasn't been any word about an album title or release date, but with the holiday sales season just weeks away, we're sure we'll be hearing something soon -- and we won't be surprised if Bieber has a few more surprise guests to announce in the meantime.

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