October 24, 2007
48:50 (Excluding Bonus Tracks)
Dan Muckala, Rob Wells, Emanuel Kiriakou, Adam Anders, John Shanks, Billy Mann, JC Chasez, Neff-U, Kara DioGuardi, Mitch Allan, David Hodges
- Everything But Mine
- Something That I Already Know
- Helpless When She Smiles
- Any Other Way
- One In A Million
- You Can Let Go
- Trouble Is
- Treat Me Right
- Love Will Keep You Up All Night
- Unsuspecting Sunday Afternoon
- Downpour [Bonus Track]
- In Pieces [Bonus Track]
- Nowhere To Go [Bonus Track]
"Unbreakable" received generally favorable reviews from most music critics. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream critics, the album received an average score of 56, based on 8 reviews, which indicates "mixed or average reviews". Bill Lamb from About.com gave the album 4 out of 5 stars, praising "the incomparably lush harmonies and instantly pleasing melodies" and calling the songs "radio friendly." Lamb also wrote that the band "have settled into a comfortable place as an adult vocal group" and named the album "a pure pop pleasure." Tammy LaGorce from Amazon.com wrote that the album "boasts Super Glue-strength harmonies and an overall tightness of sound" and that "the music is more thoughtful and mature than ever." The Reviewer from Yahoo! Voices wrote that "the boys are back with an undeniably strong album and the songs on the album fit the group incredibly."
- This marks the first album released by the Backstreet Boys without Kevin Richardson, who left to pursue other interests.
- Unlike previous Backstreet Boys albums, this album features no collaborations with longtime producers and friends Max Martin and Kristian Lundin who had worked on the group's previous albums.
- Rumored titles of the album included End to Beginning, Picking Up the Pieces, and Motivation before Brian Littrell and A.J. McLean confirmed on August 13, 2007 that the title of the album would be Unbreakable.