Calvin Harris

When in doubt, wear black, and the DJ wears the old adage well. In a black tee shirt, jeans and leather bomber jacket, he looks comfortable and sleek. The white-soled kicks are a nice touch.
When in doubt, wear black, and the DJ wears the old adage well. In a black tee shirt, jeans and leather bomber jacket, he looks comfortable and sleek. The white-soled kicks are a nice touch.
The singer dazzles in this chartreuse chiffon gown with silver beaded embellishment by Oriett Domenech. While the makeup, earrings, and clutch are pitch perfect, Underwood's hair pouf is a bit high (though, when in Vegas…).
The bodacious rapper has been more subdued on the red carpet as of late, and this Zuhair Murad gown is no exception. With the side-swept Veronica Lake wave in her hair, the Aussie beauty proves she can deliver Old-Hollywood glamour.
J Lo is wearing a plunging neckline and high half-ponytail and all is right in the world. She sizzles in this Donna Karen number, its sheer aspect tempered by a leotard — another thing the former dancer knows her way around.
Polka dots and skinny jeans have never looked so refined. The crooner paired a micro-dot blazer with a matching print dress shirt, worn buttoned to the top with no tie. And the result is undeniably dapper.
Groban looks sharp in his navy two-button blazer, paired with a black dress shirt and slacks. The polka-dot pocket square and tortoise-framed glasses add a cosmopolitan vibe.
Kesha is stunning in this strapless, mermaid gown with a body-sculpting lace appliqué and tulle overlay. Looks like she removed the $ from her name and added it to her look.
The rapper wears an unexpectedly streamlined and glamorous gown by Alexander McQueen. She pairs the peek-a-boo number with light, natural makeup and gold cuffs. She's a pillar of fashion strength, except for the issue of fit–underboob is always a no-no.
Looks like the Latin heartthrob has still got it in this two-button, shawl-collar tuxedo with a velvet lapel. Pairing a tux look with a skinny tie proves he is daring.
The singer looks sexy and cool in separates — a runway look that's made its way to the red carpet. And her layered gold bangles only amp it all up. Though she can certainly rock a crop top, a little less bust would have kept it a little classier.