Beyonce wore a plunging black Michael Costello dress on a date night in Las Vegas in 2015.

Kevin Mazur/Getty Images
Kelsey Glein
Nov 23, 2015 @ 4:15 pm

What happens in Vegas, doesn't stay in Vegas, at least not when you're Beyoncé and Jay Z. The couple attended the Miguel Cotto vs. Canelo Alvarez fight on Saturday night at the Mandalay Bay Events Center, and their coordinating ensembles were a total fashion knockout.

For the occasion, Queen Bey looked glam in plunging Michael Costello dress that featured a thigh-high center slit. The singer topped off her outfit with dazzling emerald jewelry (that matched her eyeshadow!) and a gold clutch, styling her hair in retro waves. Meanwhile, Jay Z looked extra dapper in a Tom Ford black satin peak-lapel tuxedo and bow-tie that perfectly matched his wife's gorgeous gown.

Check out more photos from their night below:

A photo posted by Beyoncé (@beyonce) on

A photo posted by Beyoncé (@beyonce) on

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A photo posted by Beyoncé (@beyonce) on

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