Topping this list of the best Instagram beauty moments is our favorite hashtag of the year, #NoMakeupMonday, created by "Confident" singer Demi Lovato.

Instagram is permeated with over-the-top makeup trends, from clown contouring to fleeked-out eyebrows, and it can all be a little intimidating. Which is why it was so refreshing when Demi Lovato introduced the #NoMakeupMonday hashtag at the beginning of 2015. Each Monday and counting, the pop star has revealed a freckly, bare-faced shot in the name of authenticity and self-love, and she invites her followers to do the same. (She has since begun #FreshFacedFriday as well, which features achievable, no makeup-makeup looks each week.)

Wild makeup trends are fun to play with, of course -- but Demi's #NMM series made Mondays our favorite day to scroll through Instagram in 2015.

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