President of Island Records David Massey (L) and Demi Lovato celebrate Nick Jonas' song "Jealous" being the #1 At Top 40 radio hit at The Ivy on January 20, 2015 in Los Angeles, United States.
(January 19, 2015 - Source: Charley Gallay/Getty Images North America) see more angles »
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Demi Lovato Crop Top

Demi Lovato wrapped up her figure in a tight black crop-top by Herve Leger for Nick Jonas' radio hit celebration.
Brand: Herve Leger

Demi Lovato Pencil Skirt

Demi Lovato continued the sexy vibe with a black bandage skirt, also by Herve Leger.
Brand: Herve Leger