Instagram Reveals 2015's Top Celebrity Throwback Photos

As we near the end of the year, it's time to look back on all the amazing moments of 2015. To help jog our memories, Instagram has released its year in review, which includes a look at the celebrities who dominated when it came to social snaps this year. One area of focus was the Throwback Thursday (#TBT) hashtag, something lots of our favourite stars have participated in throughout 2015. You probably won't be surprised by most of the names that crop up on this list of the 10 most popular celeb #TBTs of 2015, but there are a few surprise entries (and exclusions) that you won't be expecting. Can you guess who's at number one?