Katy Perry stunned in Valentino couture, Taylor Swift sparkled in Gucci, and Rita Ora donned an iridescent minidress.
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Ciara showed off her baby bump in a custom-made rose gold sequined Emilio Pucci gown and natural make-up.
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Chrissy Teigen wore a strapless, silver sequined dress by Johanna Johnson, shoes by Casedei, and Neil Lane jewelry, while her husband, John Legend, rocked a sleek black Gucci suit with a white-button down and a bow tie.
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Katy Perry pulled her look straight off the Valentino haute couture runway, wearing a white sheer and tulle gown printed with black musical notes.
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Paris Hilton channeled her inner-ice dancer, sporting a high-neck, long-sleeve white dress with some serious back cleavage.
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Taylor Swift sparkled in a shimmering silver and gold Gucci gown.
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Macklemore rocked a blue velvet suit with a white button-down and black bowtie, while Ryan Lewis opted for a black and gray houndstoon suit by Mr. Turk.
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Wearing red for the first time, Pink wore a strapless Johanna Johanson dress that made her "feel like a princess."
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Inspired by Katniss Everdeen from The Hunger Games, singer Sara Bareilles dons a hair-full of braids with a strapless, light pink, high-low gown by Blumarine.
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Young pop star Ariana Grande rocked a strapless black Dolce & Gabbana dress, printed with pink and purple flowers. "I don't know who the designers are," Grande said about fashion. "I don't always pay attention that that stuff."
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Actress Anna Kendrick sported a white Azzaro cut-out dress with an embroidered bodice, a Joan Hornig cuff, and strappy silver heels.
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Keys went daring with her cleavage, wearing a bright blue Armani Prive halter dress with a plunging neckline.
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Pharrel kept things casual in jeans, a red leather bomber jacket, and an oversized camel-colored Vivienne Westwood top hat.
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Singer Rita Ora sported agoldish-green, long-sleeve Lanvin mini-dress with Lorriane Schwartz rings, a Jimmy Choo clutch, and brightly colored nails.
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Colbie Callait donned a bright red gown by Ezra Santos, clad with a cross-body sheer panel and petal embroidery on one shoulder.
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Model Amber Rose looked stunning in a gold dress by Naeem Kahn.
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Madonna and her son David took the red carpet in matching Ralph Lauren tuxedos. The singer chose to accessorize her look with a cane and, of course, a set of grillz.
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Rapper Kendrick Lamar looked sleek in a coblat blue suit layered atop a black silk tee.
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Aside from Jared Leto's killer ombre hair, the singer/actor looked casual in a black suit accessorized with a red and gold scarf.
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Blurred Lines singer Robin Thicke donned a blue velet suit by Giorgio Armani and his signature aviators while his wife, Paula Patton, channeled her inner-zebra in a black and white dress.
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The legendary Cyndi Lauper took the red carpet in a black Alexander McQueen ensemble. She accessorized with an oversized gold necklace and Jimmy Choo heels.
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Gloria Estefan wore a form fitting red Gustavo Cadile dress with a sheer neckline and floral appliques.
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