The theme for tonight's Costume Institute Gala at the Metropolitan Museum of Art  might've allowed less room for full-on sexbomb outfits than last year's anything-goes punk approach , but don't worry: where there's a red carpet, there are bound to be some sultry numbers. Whether it was a low-cut front or a high (high) leg slit, ladies like Lea Michele , Chrissy Teigen, and Nicole Richie  had sexy on tap. Scroll down to see all the best.
Kate Upton at the Costume Institute Ball
A semisheer Dolce & Gabbana  dress with a corset and underwire bustier made sure to flaunt Kate Upton's famous curves.
Beyoncé at the Costume Institute Ball
Beyoncé went bold in a Givenchy  Haute Couture mousseline dress embroidered with a mix of crystals, stones, and studs. Under it, she wore a bodysuit and fishnets.
Cara Delevingne at the Costume Institute Ball
What ball gown? Cara Delevingne showed that she plays by her own rules in a two-piece set made up of an intricate crop top and skinny white pants.
Kim Kardashian at the Costume Institute Ball
While we've certainly seen sexier from Kim Kardashian , the high slit of her midnight blue dress rose nearly to waist level, ensuring things maintained a certain amount of steaminess.
Naomi Watts at the Costume Institute Ball
The ombre hue of Naomi Watts 's custom Givenchy  Haute Couture dress was gorgeous, but what we couldn't take our eyes off was the sheer skirt that let flaunted her stems.
Rihanna at the Costume Institute Ball
Rihanna 's pure white look was far from angelic, thanks to the cropped top that fell right below her bust (allowing a tattoo to peek through!).
Chrissy Teigen at the Costume Institute Ball
Chrissy Teigen wore a one-of-a-kind Ralph Lauren  Collection halter dress covered with Swarovski  crystals and organza ruffles. For accessories, she picked Lorraine Schwartz earrings.
Dree Hemingway at the Costume Institute Ball
Dree Hemingway had a retro moment in a Proenza Schouler  dress that hit at midcalf, white Rupert Sanderson pumps, and Harry Winston earrings.
Georgia May Jagger at the Costume Institute Ball
Georgia May Jagger went for it up top and on bottom with a neckline that dipped to her navel and a high slit on the leg. For shoes, she picked suede Sergio Rossi  heels.
Lea Michele at the Costume Institute Ball
Lea Michele  sizzled in a backless golden Altuzarra  dress and Lorraine Schwartz accessories.
Nicole Richie at the Costume Institute Ball
Nicole Richie  skipped volume in favor of a custom-dyed velvet Donna Karan  Atelier  gown, worn with Christian Louboutin  shoes, a Zagliani  clutch, and custom diamond House of Harlow  jewelry (including ear cuffs!).
Zoe Saldana at the Costume Institute Ball
The neckline of Zoe Saldana 's custom black cashmere Michael Kors  bodysuit went low enough to show off some cleavage. Atop it, she picked a black and white lace taffeta skirt, also by the label.
Olivia Munn at the Costume Institute Ball
Even with long sleeves and a floor-length hem, Olivia Munn couldn't help but sizzle in her dress. For jewels, she picked Fred Leighton.
Zoe Kravitz at the Costume Institute Ball
In a slip of a dress, Zoe Kravitz's silk Topshop  number was definitely more sensual than the voluminous ball gowns we spotted.