TEEN

Demi Lovato Birthday: 21 Reasons You Should Consider Joining Her Lovatic Army

UNIVERSAL CITY, CA - AUGUST 11:  Singer Demi Lovato performs onstage at the Teen Choice Awards 2013 at the Gibson Amphitheatr
UNIVERSAL CITY, CA - AUGUST 11: Singer Demi Lovato performs onstage at the Teen Choice Awards 2013 at the Gibson Amphitheatre on August 11, 2013 in Universal City, California. (Photo by Kevin Winter/Getty Images)

Demi Lovato just turned 21! In honor of her birthday, her fans (a.k.a Lovatics) took to Twitter to share all the reasons they worship the pop singer, "X Factor" judge and upcoming "Glee" star.

We chose 21 of our favorites from the worldwide trending topic, below. Share your additions with us by tweeting @HuffPostTeen, and scroll down to see an EPIC slideshow of fan art in honor of her birthday!

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