Gomez wears a shimmering red halterneck dress by Givenchy with dramatic plunging back.

The actress-singer wears a flirty pink top and coordinating skirt by Emanuel Ungaro.

Underwood in an embellished Elie Madi dress with dramatic sheer cape sleeves.

The singer in a sheer black floor-length Reem Acra grown with Stuart Weitzman heels and H.Stern star rings.

The model wore head-turning white separates by Bao Tranchi and a Sutra diamond ear climber.

The singer wore a sleeved black and gold gown with a dramatic plunging back by Lorena Sarbu.

The singer and The Voice star wowed in a dramatic sheer black outfit by Yousef Al-Jasmi.

The actress wore an allover sequined gold gown and Eva Fehren rings.

The actress wore a sequin-encrusted top and matching jacket, with a sweeping white skirt. 

The model wore a shimmering sheer gray dress by Naeem Khan.

The actress shimmers in a silver lamé dress.

The Swedish singer wore a black lattice-work dress.

The actress-dancer wore a patterned gown by Naeem Khan.

The actress wears a black slip dress.

The actress-singer wore a striped romper with Brian Atwood heels.

The Pretty Little Liars actress wore a peacock green suit.

The pop star chose to go casual in a printed tee and distressed jeans.

The pop star wore a floor-length black gown.

The reality and social media star wore a custom Bryan Hearns dress with Tamara Mellon shoes, and a Giuseppe Zanotti clutch.

The model wears a black mini-dress by Oriett Domenech with Balmain heels, an Elie Saab clutch, and Neil Lane jewelry.

The One Direction singer pulls out the stops in a floral Gucci suit.

The British singer wears an asymmetrical design by Alexandre Vauthier Couture.

The singer opts for a gray suit by Topman.