Beyoncé's Lingerie Trick Will Forever Change How You Wear Thigh-High Dresses

Beyoncé has been serving up plenty of amazing date-night looks since giving birth to Sir Carter and Rumi. But for her first official red carpet moment, the singer really delivered. Beyoncé was spotted with her husband, JAY-Z, at Rihanna's star-studded Diamond Ball.

For the occasion, Beyoncé rocked a slinky House of CB gown that was so sexy, even her husband couldn't stop smiling. The emerald gown featured a plunging neckline and thigh-high slit. It wasn't until she started to walk that we realized that Bey was actually wearing a pair of one-legged Spanx. It seems like the singer's stylist cut them so she could still get the coverage she needed without ruining the gown's silhouette.

Beyoncé finished off her look with a pair of black Giuseppe Zanotti platform heels, Lorraine Schwartz diamond cuffs, and a Lee Savage clutch. Have a look at all angles of the star's ensemble ahead, and buy her exact outfit if you're feeling inspired.