Fifth Harmony is an American girl group formed on the second season of the The X Factor USA in July 2012. The group consists of members Ally Brooke, Normani Kordei, Dinah Jane, Camila Cabello, and Lauren Jauregui. They signed a joint deal with Syco Music, owned by Simon Cowell, and Epic Records, L.A. Reid's record label, after finishing in third place on the show. Since then, they have released an EP and a full-length album.

2015 was a great year for the girls. The group released their debut studio album, Reflection in February 2015. It debuted at number five on the Billboard 200, selling 62,000 copies in the first week and was supported by the group's first major headlining tour, The Reflection Tour. The album included the singles "BO$", "Sledgehammer" and the U.S. triple platinum "Worth It".

Get ready Harmonizers! We count down the top 10 best moments of your favorite girl group. What was your favorite episode from the year?

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