Demi Lovato turns 21 today (Aug. 20), and since we've already looked at her best hairstyles, we've decided to celebrate her big 2-1 by taking this walk down memory lane and reliving her many, many magazine covers over the years.

From her days as a fresh-faced Disney teen -- wait till you revist her shared cover with Selena Gomez, who just turned 21 in July -- to her more smoldering, sultry post-rehab covers, there are two things you can always expect from a Demi Lovato mag spread without fail. One is that she won't have the same hair cut or color as her last cover. Second is that she will look absolutely gorgeous!

Happy birthday Demi! You can consider your pals at PopCrush to be Lovatics.

Check out this rundown of some of her best magazine covers, in no particular order.

Demi Lovato Cosmopolitan
Cosmopolitan
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Demi Lovato Cosmo on Campus Spring 2013
Cosmo on Campus
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Demi Lovato Cosmo July 2012 Cover
Cosmopolitan
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Demi Lovato Demi Cover
Demi
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Demi Lovato Dolly Mag Cover
Dolly
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Demi Lovato Fashion August 2013 Cover
Fashion
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Demi Lovato GL Cover
GL
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Demi Lovato Joe Jonas Creme Cover
Creme
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Demi Latina
Latina
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Demi Lovato Self Cover
Self
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Demi Lovato Seventeen Cover 2011
Seventeen
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Demi Lovato Seventeen
Seventeen
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Demi Lovato Teen Cover
Teen
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Teen Vogue Demi Lovato Joe Jonas
Teen Vogue
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Demi Lovato Teen Vogue
Teen Vogue
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Demi Lovato TV Guide Cover
TV Guide
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Demi Lovato You Feb. 12
You
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