Fifth Harmony are on a roll! Their single Worth It was recently certified double platinum, they celebrated the release of their new video for I’m In Love With A Monster by premiering it in Times Square, and they sold out The Beacon Theatre. In addition to the look at the fab quintet‘s performance on Thursday (8-27-15) at The Beacon, here’s a special Fifth Harmony flashback: a few words from the ladies and a taste of their performance at Hammerstein Ballroom in December of 2013 before they appeared at Madison Square Garden as part of Jingle Ball…